The Thirteen Problems - Agatha Christie

Summary
"The Thirteen Problems" is a collection of thirteen short mystery stories featuring Agatha Christie's amateur detective Miss Jane Marple. The book is divided into two main parts. The first six stories are told during "The Tuesday Night Club" meetings, where Miss Marple, her nephew Raymond West, artist Joyce Lemprière, lawyer Mr. Petherick, clergyman Dr. Pender, and former Scotland Yard Commissioner Sir Henry Clithering challenge each other to solve unsolved mysteries they present. Each member takes turns recounting a puzzling crime, and Miss Marple, with her keen understanding of human nature and village life, consistently identifies the correct culprit. The remaining seven stories continue this format with a slightly altered group of acquaintances, including Colonel and Mrs. Bantry, Dr. Lloyd, and Inspector Slack, further showcasing Miss Marple's unparalleled deductive abilities.

Book Sections

Section 1
The Tuesday Night Club

Raymond West, a novelist, and Joyce Lemprière, an artist, are visiting Miss Marple. They are joined by Dr. Pender, a clergyman, Mr. Petherick, a solicitor, and Sir Henry Clithering, a retired Commissioner of Scotland Yard. Raymond suggests they form a "Tuesday Night Club" where each person tells an unsolved mystery, and the others try to solve it. Sir Henry recounts the first case. Mr. and Mrs. Parkinson, a wealthy couple, host a dinner party. After dinner, Mrs. Parkinson becomes ill and dies from arsenic poisoning. Her husband, Mr. Parkinson, is immediately suspected because he had just bought rat poison, and the cook claims she saw him preparing something in the kitchen. The police arrest Mr. Parkinson, but the case falls apart when no clear evidence links him to the poisoning. Miss Marple listens intently and suggests that the poisoning must have been during the dinner, likely involving a subtle swap or misdirection. She points out that the cook mentioned Mrs. Parkinson had eaten a certain dish with prawns, which the cook herself hated, making it clear she hadn't touched it. Miss Marple deduces that Mrs. Parkinson had ordered the dish specifically knowing her husband wouldn't eat it, then manipulated him into taking a dose meant for herself or simply swapped plates. The true culprit was Mrs. Parkinson herself, intending to frame her husband for murder to avoid an impending financial scandal or divorce, and then commit suicide. The "arsenic" found was merely a decoy, and the real poison was in her own glass. Sir Henry confirms Miss Marple is correct, though the police never formally proved it.

Character	Characteristics	Motivations
Miss Jane Marple	Elderly, astute, keen observer of human nature	Enjoyment of puzzles, desire for truth and justice
Raymond West	Novelist, Miss Marple's nephew	Intellectual stimulation, amusement, respect for his aunt's mind
Joyce Lemprière	Artist	Intellectual stimulation, amusement
Dr. Pender	Clergyman	Intellectual curiosity, belief in justice
Mr. Petherick	Solicitor	Intellectual curiosity, professional interest in legal puzzles
Sir Henry Clithering	Retired Commissioner of Scotland Yard	Enjoyment of puzzles, respect for Miss Marple's abilities
Mr. Parkinson	Wealthy, subject to scandal	(Suspected of) Murder, but eventually framed by his wife
Mrs. Parkinson	Wealthy, devious, prone to scandal	Frame husband, commit suicide to escape scandal

Section 2
The Idol House of Astarte

Dr. Pender tells the next story. He was staying at the country house of Sir Richard Haydon, known as "Haydon's Folly," along with a group of other guests, including Diana Ashley and Maurice Wren. The house had a strange, ancient "idol house" on its grounds, believed by some to be cursed. One evening, a costume party is held. Diana Ashley, an enigmatic and beautiful woman, suggests a "ritual" in the idol house. Sir Richard, dressed as Astarte, follows Diana into the structure. A few moments later, a scream is heard, and Sir Richard emerges, staggering, and collapses, dead from a stab wound. There seems to be no one else present in the idol house, and the weapon vanishes. Maurice Wren is deeply in love with Diana. Miss Marple quickly deduces that the "ghost" was real, or rather, the illusion of one was used. She points out the dramatic nature of Diana's suggestion and the specific timing. She concludes that Diana Ashley was the murderer, using her theatricality and a simple trick to commit the crime. Diana had stabbed Sir Richard while they were alone in the idol house, then pretended he had emerged alone. The "ghost" seen by others was likely Diana herself, slipping back unnoticed. Her motivation was likely financial or a desire to be free of Sir Richard without attracting suspicion. Miss Marple's solution: Diana had dressed up in an identical Astarte costume as Sir Richard, and after stabbing him, emerged disguised as him, then slipped away, letting others believe he was alone when he staggered out.

Character	Characteristics	Motivations
Sir Richard Haydon	Owner of "Haydon's Folly," victim	(Unspecified)
Diana Ashley	Enigmatic, beautiful, manipulative	Murder Sir Richard (likely for inheritance or freedom), escape detection
Maurice Wren	In love with Diana Ashley	(Unspecified)

Section 3
Ingots of Gold

Mr. Petherick recounts a case he was involved in. His client, a wealthy individual named Mr. Carlile, had inherited a property in Cornwall. Carlile suspected that a treasure of gold ingots was hidden there, stolen from a sunken Spanish galleon. He hired a surveyor, Mr. Kelvin, to search for it. Mr. Kelvin, however, disappeared under mysterious circumstances. His assistant reported that Kelvin had been inspecting the grounds, particularly an old tin mine shaft, and had vanished. There were hints of a strange, superstitious local element and a warning sign about "cursed gold." Miss Marple focuses on the practicality of hiding and transporting ingots. She suggests the disappearance of Kelvin was not due to the supernatural but was a very human crime. She points out that the assistant was the only one with Kelvin and stood to gain. The assistant, a local man, claimed Kelvin fell into the mine shaft. However, the ingots were discovered much later, not in the shaft, but under a loose flagstone in the kitchen. Miss Marple deduces that the assistant had murdered Kelvin, hid the body, and planned to retrieve the ingots later. He claimed Kelvin fell into the shaft to explain his disappearance, knowing the ingots were safely hidden elsewhere. He made up the "cursed gold" story to deter others. The Ingots of gold had been found by Kelvin, and the assistant murdered him for them.

Character	Characteristics	Motivations
Mr. Carlile	Wealthy, client of Petherick	Find inherited gold
Mr. Kelvin	Surveyor, victim	Find gold, professional duty
Kelvin's Assistant	Local, deceptive	Murder Kelvin, steal gold, cover up crime

Section 4
The Bloodstained Pavement

Joyce Lemprière tells her story. She was on holiday in a coastal village and witnessed a curious scene. A man, Dennis, and his wife, Carol, were painting. Carol frequently flirted with a third person, a younger woman named Margery. One day, Joyce saw Dennis struggling with a woman on a cliff path, followed by a splash and a body in the water. She rushed to tell the police but later found out that Dennis had simply pushed Margery into the water as a joke. Carol was seen perfectly alive and well, swimming nearby. Joyce was perplexed, as she clearly saw Dennis with Carol on the cliff, wearing a distinctive yellow bathing cap, and that it was Carol’s body in the water. The next day, Carol's body was indeed found, drowned. It appeared to be an accidental drowning, but Joyce insisted she saw something else. Miss Marple explains that Joyce indeed saw what she thought she saw, but misinterpreted the identities. She clarifies that there were two women wearing similar yellow bathing caps: Carol and Margery. On the day of the initial incident, Dennis pushed Margery into the water as a joke. The woman Joyce saw Dennis struggling with on the cliff was Carol, who was actually being murdered by Dennis (or possibly Margery). The "body" Joyce saw in the water that first time was Margery, who was just playing along. The actual murder of Carol happened later. The key was the similarity of the bathing caps and the fact that Joyce only saw them from a distance. The culprit was Dennis (or Margery) who drowned Carol for her inheritance, using the "joke" to confuse witnesses.

Character	Characteristics	Motivations
Dennis	Man in the story, possibly the murderer	Drown Carol (wife), possibly for inheritance
Carol	Dennis's wife, victim, flirtatious	(Unspecified)
Margery	Young woman, similar to Carol in appearance	(Unspecified)

Section 5
Motive v. Opportunity

Sir Henry Clithering tells his second story, a case from his professional career. Old Mr. Symes, a wealthy but tyrannical man, lived in a large house with his three nephews and nieces who were dependent on him. Symes had a habit of leaving his will on his desk, often changing it, creating a tense atmosphere. One night, he was found dead from a fall down the stairs. It was deemed an accident because he often went down to get a biscuit. However, suspicion fell on his nephew, George, who had a strong motive (inheritance) and opportunity. George had gone out to buy medicine late at night, and during that time, his uncle died. The crucial point was a clock found at the bottom of the stairs, stopped at a particular time. Miss Marple points out that the "accident" was too perfect. The presence of the clock, stopped at a specific time, seems like a clumsy attempt to establish an alibi. She suggests that it wasn't George but another relative. Specifically, the victim's niece, Amelia. Amelia had set the clock for a later time, then staged the fall to look like an accident. She then placed the clock at the bottom of the stairs, stopping it to suggest the accident happened during George's absence, thus framing him. Her motive was also inheritance, but she wanted to ensure George was implicated and she escaped suspicion.

Character	Characteristics	Motivations
Mr. Symes	Wealthy, tyrannical, victim	(Unspecified)
George	Nephew of Symes, suspected	Inherit from uncle
Amelia	Niece of Symes, actual culprit (as deduced by MM)	Inherit from uncle, frame George

Section 6
The Thumb Mark of St. Peter

Miss Marple tells her own story, which happened in her village of St. Mary Mead. Her niece, Mabel, was unhappily married to a man named Geoffrey. Mabel was distraught when Geoffrey died suddenly, reportedly from natural causes, though she hinted that it wasn't. Mabel became depressed and eventually committed suicide. Before she died, she had mentioned seeing a "thumb mark of St. Peter" (a fish with a thumb-like mark, also known as a John Dory) and had tried to tell Miss Marple something important about Geoffrey's death. Miss Marple visited Mabel, who was visibly distressed. Miss Marple knew Mabel was being poisoned, likely by someone close. She remembered a local saying related to the fish. The family doctor had initially ruled the death natural, but Miss Marple suspected otherwise. She pieces together Mabel's cryptic clues and her strange behaviour. The "thumb mark of St. Peter" refers to a fish. Mabel was poisoned with phosphorus (rat poison), which has a strong garlic-like smell. The fish Mabel saw was likely being cooked to mask the smell of the poison being administered to her, as the strong smell of a John Dory (or similar fish) could cover the smell of phosphorus from rat poison. Mabel was trying to tell Miss Marple that she herself was being poisoned, and that Geoffrey was also poisoned using the same method, or that the fish was related to his death. Miss Marple deduced that the culprit was Mabel's controlling brother-in-law, who was slowly poisoning both Mabel and Geoffrey, perhaps for their inheritance.

Character	Characteristics	Motivations
Mabel	Miss Marple's niece, victim	Reveal truth about her husband's death, avoid her own poisoning
Geoffrey	Mabel's husband, victim	(Unspecified)
Brother-in-law	Mabel's controlling brother-in-law	Murder Mabel and Geoffrey (likely for inheritance), cover up crimes

Section 7
The Blue Geranium

The "Tuesday Night Club" evolves into a new group, meeting at Mrs. Bantry's house. Present are Miss Marple, Colonel Bantry, Mrs. Bantry, Jane Helier (a famous actress), Dr. Lloyd, and Inspector Slack. Mrs. Bantry tells the first story. A wealthy woman, Mrs. Pritchard, was obsessed with fortune-telling and superstitions. A local psychic had told her that a blue geranium would appear in her wallpaper pattern just before her death. Mrs. Pritchard's husband, George, and her companion, Miss Marple, witnessed the events. One evening, Mrs. Pritchard screamed, and a blue geranium was indeed visible on her wallpaper pattern. She collapsed and died, supposedly of heart failure, but a later autopsy revealed cyanide poisoning. Miss Marple, listening to the details, focuses on the "blue geranium" and how it appeared. She asks about the wallpaper. She suggests that the blue geranium was not a supernatural prediction but a carefully orchestrated illusion. She deduces that it was Mrs. Pritchard's husband, George, who murdered her. He had subtly dabbed the wallpaper with an ammonia-based solution or similar chemical, which, when reacting with the pigment of the existing wallpaper, would turn a section blue, giving the illusion of a geranium appearing. The "psychic's" prediction served as a perfect red herring. George Pritchard used the superstition to make his wife's death seem foretold and natural.

Character	Characteristics	Motivations
Colonel Bantry	Mrs. Bantry's husband, host	Intellectual curiosity
Mrs. Bantry	Hostess, storyteller	Intellectual curiosity, enjoyment of puzzles
Jane Helier	Famous actress	Intellectual curiosity
Dr. Lloyd	Medical doctor	Intellectual curiosity, professional interest
Inspector Slack	Police inspector	Professional interest, respect for Miss Marple's insights
Mrs. Pritchard	Wealthy, superstitious, victim	(Unspecified)
Mr. George Pritchard	Mrs. Pritchard's husband, the murderer (deduced)	Murder wife (likely for inheritance or to be free of her), cover up

Section 8
The Companion

Dr. Lloyd tells his story. He was on holiday in Las Palmas when two Englishwomen, Miss Mary Barton and Miss Amy Durrant, arrived. They were companions, but Miss Barton was domineering, and Miss Durrant was meek. One day, they went for a swim, and Miss Barton drowned. It initially appeared to be an accidental drowning, but Dr. Lloyd suspected foul play. The key detail was that Miss Durrant claimed Miss Barton had a cramp, but she herself was an excellent swimmer and should have been able to help. Miss Marple immediately seizes on the nature of the relationship between the two women. She points out the imbalance of power and the possibility of a desperate act. She deduces that Miss Durrant, the seemingly meek companion, murdered Miss Barton. Miss Durrant, tired of Miss Barton's abuse and control, saw an opportunity while swimming. She held Miss Barton's head underwater, then pretended to have been unable to help due to cramp or panic, knowing that no one would suspect the quiet, submissive companion. Miss Marple reveals that Miss Durrant had been replaced by her twin sister. The original meek Miss Durrant had been murdered by Miss Barton, and the more assertive sister came to exact revenge.

Character	Characteristics	Motivations
Miss Mary Barton	Domineering, victim	(Unspecified)
Miss Amy Durrant	Meek, companion (actual murderer as deduced)	Murder Miss Barton (for revenge/freedom), cover up crime

Section 9
The Four Suspects

Sir Henry Clithering tells another case. Dr. Rosen, a German academic, was killed by a fall down the stairs. Dr. Rosen was involved with a secret society and had a valuable formula. There were four main suspects who lived in his house: his niece, his secretary, his old servant, and a young man who was an acolyte. Each of them had a motive and opportunity, but no clear evidence. The police were baffled. Miss Marple focuses on the seemingly perfect setup and the hidden nature of the German society. She suggests that the murder was carefully planned to look like an accident, and the formula was the key motive. She deduces that it was the niece, who had a secret connection to the society and was trying to retrieve the formula. The other suspects were red herrings. Miss Marple theorizes that the murderer wasn't one of the four obvious suspects, but rather a fifth person, an outsider, who was manipulating events. The formula was a decoy. The true motive was a vendetta from the German secret society. Miss Marple concludes that one of the four was not the killer, but was being framed by one of the others, a known agent. Sir Henry confirms that one of the "suspects" was indeed the killer, a member of the secret society sent to eliminate Dr. Rosen, and it was the old servant. He was loyal to the organization, not to Dr. Rosen.

Character	Characteristics	Motivations
Dr. Rosen	German academic, victim	(Unspecified)
Rosen's niece	Suspect, lived with Rosen	(Unspecified)
Rosen's secretary	Suspect, lived with Rosen	(Unspecified)
Rosen's old servant	Suspect, lived with Rosen, the murderer (deduced)	Loyalty to secret society, eliminate Dr. Rosen
Young acolyte	Suspect, lived with Rosen	(Unspecified)

Section 10
A Christmas Tragedy

Miss Marple tells another story from St. Mary Mead. She and Colonel Bantry were staying at a hotel in another town for Christmas. She observed a couple, the Jacksons, who seemed perfectly happy. She then saw Mrs. Jackson having a secret conversation with a younger man. Shortly after, Mr. Jackson died, supposedly from poisoning. The police suspected Mrs. Jackson because she was having an affair and had a clear motive. However, there was no direct evidence, and the case was complicated. Miss Marple focuses on the apparent perfection of the crime and Mrs. Jackson's theatrical nature. She quickly deduces that Mrs. Jackson was indeed the murderer, but not in the way the police thought. Mrs. Jackson had planned to murder her husband, but she deliberately made herself obvious in her flirtations to throw suspicion on herself in a clumsy way, creating a red herring. The actual murder was carefully disguised. She had a strong, controlling personality. Miss Marple deduces that Mrs. Jackson poisoned her husband by substituting his usual medicine with poison, making it look like a tragic accident, while her affair served to distract.

Character	Characteristics	Motivations
Mr. Jackson	Victim, husband	(Unspecified)
Mrs. Jackson	Theatrical, having an affair, the murderer (deduced)	Murder husband (likely for freedom/inheritance), cover up crime
Young Man	Mrs. Jackson's lover	(Unspecified)

Section 11
The Herb of Death

Colonel Bantry tells his story. A dinner party was held at a country house, and after consuming sage and onion stuffing with the goose, four guests fell ill. One of them, a clergyman named Dr. Brabazon, died. It was suspected that the herb, sage, had been accidentally replaced with a poisonous herb. The cook was distraught, but no one could prove malice. Miss Marple, upon hearing this, immediately dismisses the idea of an accidental substitution. She focuses on the specific herb and the common knowledge of plants. She deduces that it was not an accidental substitution but a deliberate poisoning, carefully orchestrated. The poisoned herb was foxglove (digitalis), which looks similar to sage if not carefully inspected. The motive was not widespread. The victim was Dr. Brabazon. The culprit, as Miss Marple deduces, was the host, a seemingly charming man who had a secret motive to eliminate Dr. Brabazon. He used the "accidental" poisoning to cover his tracks. The host wanted to eliminate Dr. Brabazon, who knew something about his past. He planted the foxglove, knowing it would be mixed in with the sage.

Character	Characteristics	Motivations
Dr. Brabazon	Clergyman, victim	(Unspecified)
The Host	Seemingly charming, murderer	Eliminate Dr. Brabazon (who knew a secret), cover up crime

Section 12
The Affair at the Bungalow

Jane Helier, the actress, tells her story, though she admits she was deeply confused by it. She was performing in a play and received an anonymous letter warning her of a plot to kill her. She was persuaded by her young leading man, Leslie Faulkener, to let him impersonate her during a private meeting at a bungalow to catch the culprits. However, when she arrived at the bungalow, she found him apparently dead, and a woman (Miss Pauline, the secretary) screaming, claiming she had found the body. The police were called, but the whole situation was a mess, with multiple contradictory statements. Miss Marple listens and quickly sees through the theatrical deception. She points out that as an actress, Jane Helier herself was susceptible to dramatic setups. Miss Marple deduces that the entire "plot" and the "murder" were an elaborate hoax, specifically orchestrated by Leslie Faulkener himself. He was attempting to stage his own apparent death, perhaps to collect insurance, escape debts, or to disappear and reappear later under a new identity. Miss Pauline, the secretary, was in on the plan, acting as a co-conspirator. The "anonymous letter" was part of the setup to involve Jane Helier and create a dramatic, confusing scenario that would divert suspicion from Faulkener's true intentions.

Character	Characteristics	Motivations
Jane Helier	Famous actress, naive about the plot	Avoid danger, help uncover truth
Leslie Faulkener	Leading man, orchestrator of the hoax (deduced)	Stage his own "death" (for insurance, debt evasion, new identity), deceive Helier
Miss Pauline	Secretary, accomplice	Assist Faulkener in his hoax

Section 13
Death by Drowning

Inspector Slack, the local police inspector, tells the final story, which happened in Miss Marple's own village of St. Mary Mead. A young, pregnant girl named Rose Emmott was found drowned in the local brook. It was assumed to be suicide, as she was known to be distressed about her condition and the father of her child, a local wealthy man named Rex Sandford, had refused to marry her. However, her grandmother, a tough old woman, refused to believe it was suicide and insisted it was murder. She tried to convince the police, but they had no evidence. Miss Marple, who knew Rose and the people of the village well, already has her suspicions. She points out that Rose was not the type to commit suicide. She also knew that the grandmother was very protective of Rose. Miss Marple focuses on the details of the drowning and the behavior of the people involved. She deduces that Rose's drowning was not suicide but murder. The killer was Rex Sandford, the father of the child. He had promised to marry Rose but never intended to. He lured her to the brook, possibly under the pretense of discussing their future, and drowned her to avoid the scandal and responsibility. His motive was to protect his reputation and avoid marriage to a lower-class girl. The fact that Rose's body was found in the brook, a shallow body of water, made it look like a tragic accident.

Character	Characteristics	Motivations
Rose Emmott	Young, pregnant girl, victim	(Unspecified)
Rex Sandford	Wealthy man, father of Rose's child, the murderer	Avoid scandal, avoid marriage, protect reputation
Rose's Grandmother	Protective, insistent on murder	Seek justice for granddaughter

Genre
Detective fiction, mystery, short stories.

Author Data
Agatha Christie (1890-1976) was an English writer known for her detective novels and short stories. She is best known for her 66 detective novels and 14 short story collections, particularly those featuring fictional detectives Hercule Poirot and Miss Marple. She also wrote the world's longest-running play, The Mousetrap. During World War I and II, she worked in hospital dispensaries, which gave her knowledge of poisons that were often featured in her books. She is the best-selling fiction writer of all time, with her books having sold more than two billion copies.

Morale
The overarching morale of "The Thirteen Problems" is that true understanding of human nature, human weakness, and village gossip can often be more effective in solving crimes than purely logical deduction or forensic science. Miss Marple consistently solves the mysteries by drawing parallels to everyday events and common human motivations she has observed in her quiet village life, proving that even the most elaborate deceptions can be uncovered by those who truly understand people. It highlights that seemingly insignificant details, once correctly interpreted, can reveal the truth.

Curiosities

• "The Thirteen Problems" was originally published as short stories in various magazines before being collected into a single volume.
• The character of Miss Marple was introduced to the public in the short story "The Tuesday Night Club" (the first story in this collection) in 1927, though she had appeared in a short story called "The Case of the Discontented Soldier" even earlier. Her first novel appearance was in "The Murder at the Vicarage" (1930).
• The framing device of a club where members tell and solve mysteries was a popular format in detective fiction of the time. Arthur Conan Doyle's "The Red-Headed League" is another famous example of this style.
• The title for "The Thumb Mark of St. Peter" refers to a species of fish (the John Dory) which is said to have dark spots on its sides that resemble thumbprints, linked to a Christian legend involving Saint Peter.
• Many of the stories in this collection are among Miss Marple's earliest recorded cases, offering a glimpse into her developing deductive prowess before her full novel-length adventures.