The Big Four · Chapters
Chapters explained
Chapter companions for The Big Four by Agatha Christie.
Chapter 1
The Unexpected Guest
Hastings visits Poirot, who is about to depart for South America on a mysterious commission from Abe Ryland. Before he leaves, a stranger arrives at Poirot's flat in a state of collapse, repeatedly murmuring 'M. Hercule Poirot, 14 Farraway Street.' The man, examined by Dr. Ridgeway, is suffering from shock and exhaustion. When Hastings jokingly suggests calling a story 'The Mystery of the Big Four,' the stranger suddenly awakens and names 'Li Chang Yen,' then delivers a cryptic description of the 'Big Four'—a global criminal organization—before collapsing again. Poirot, realizing the gravity of the situation, abandons his journey at the last moment by jumping off the train.
Chapter 2
II: The Man from the Asylum
Poirot and Hastings return to London after realizing the train diversion was a plot to get Poirot out of the way. They find their guest dead, apparently from natural causes, but Poirot deduces he was gagged and poisoned with prussic acid. A man claiming to be an asylum keeper arrives to identify the dead man as an escaped patient, but later Poirot learns no escape occurred. Japp identifies the victim as Mayerling, a Secret Service agent who disappeared in Russia five years ago. Poirot concludes the killer is Number Four, the destroyer, and that the Big Four have begun a duel to the death.
Chapter 3
We Hear More About Li Chang Yen
A week after the fake asylum attendant's visit, Hastings hopes the man will return, but Poirot dismisses the idea. The inquest results in a verdict of accidental death. Poirot then takes Hastings to visit Mr. John Ingles, a retired Civil Servant with deep knowledge of Chinese underground life. Ingles reveals that Li Chang Yen is a mastermind behind global unrest, controlling revolutions and using scientific weapons. He describes how four men who opposed Li Chang Yen died mysteriously. Ingles also shares a letter from a man named Jonathan Whalley, who claims to be hiding from 'The Big Four,' prompting Poirot to immediately set out for Dartmoor.
Chapter 4
IV: The Importance of a Leg of Mutton
Poirot and Hastings, accompanied by Ingles, investigate the murder of Mr. Whalley at Granite Bungalow. Poirot examines the scene, noting footprints and bloodstains, and deduces that the murderer was a youngish man who arrived by trap, not Robert Grant. He discovers a frozen leg of mutton in the larder, which proves that someone had visited the bungalow that morning, contradicting witness statements. Poirot later interviews Grant and secures his release, revealing the murderer's clever use of the frozen meat to avoid suspicion.
Chapter 5
V: Disappearance of a Scientist
After the trial of Robert Grant, Poirot and Hastings receive a visit from Inspector Japp and Captain Kent of the US Secret Service, who reveal that a scientist named Halliday has disappeared in Paris. Halliday was working on a powerful wireless energy device that the Big Four may have used to sink American naval vessels. Poirot agrees to investigate and visits Mrs. Halliday, who confirms her husband vanished after a trip to Paris, leaving behind only a small suitcase. Poirot decides to go to Paris to find the truth.
Chapter 6
The Woman on the Stairs
Poirot and Hastings travel to Paris to investigate the disappearance of John Halliday. They interview Professor Bourgoneau and Madame Olivier, who confirms Halliday discussed his scientific work with her. Poirot notices a woman in mourning who enters the villa and runs upstairs without looking at them, finding her behavior suspicious. After a near-fatal accident with a falling tree, Poirot deduces that Halliday was likely kidnapped by the Big Four, possibly impersonated by Number Four, and that the woman on the stairs may have been involved. Halliday is later rescued from a villa by the Countess Rossakoff, but refuses to speak about his ordeal, fearing reprisals against his family.
Chapter 7
VII: The Radium Thieves
After Halliday's release, Poirot and Hastings remain in Paris. A mysterious visitor attempts to bribe Poirot to abandon his pursuit of the Big Four, but Poirot sees through the ruse. They then visit Madame Olivier, who reveals that her secretary, Inez Veroneau (actually the Countess Rossakoff), has disappeared and that valuable papers and radium were nearly stolen. Poirot devises a plan to protect the radium by pretending to leave for England.
Chapter 8
In the House of the Enemy
Hastings, under the alias Major Neville, infiltrates the household of Abe Ryland, whom Poirot suspects of being Number Two of the Big Four. He discovers that Ryland receives letters marked with a '4' and flies into a rage when one is accidentally opened. Hastings deciphers a coded message from the letter and arranges a meeting with Poirot, but the man he meets is a disguised footman. Poirot's plan backfires when Inspector Japp reveals the footman's hoax, yet Poirot remains convinced that Ryland is Number Two and the footman is Number Four.
Chapter 9
IX: The Yellow Jasmine Mystery
Hastings expresses frustration over the lack of tangible progress against the Big Four, while Poirot remains confident. They travel to Market Handford to investigate the death of Mr. Paynter, initially thought to be an accident but now suspected murder. The case involves a poisoned curry, a cryptic dying message ('Yellow Jasmine'), and a charred body. Poirot, despite his obsession with the Big Four, decides to focus on this mystery to clear his mind.
Chapter 10
X: We Investigate at Croftlands
Poirot and Hastings join Inspector Japp at Croftlands to investigate the death of Mr. Paynter. The scene is ambiguous—possible accident or murder—with a locked room, a drugged curry, and a missing manuscript titled 'The Hidden Hand in China'. Poirot interrogates Ah Ling, who reacts with terror when Poirot traces the Big Four symbol. Suspicion falls on Gerald Paynter, but Poirot later deduces that the dying message 'Yellow Jasmine' refers to a poison, revealing the true cause of death and pointing to Dr. Quentin as the murderer.
Chapter 11
XI: A Chess Problem
Poirot and Hastings dine with Inspector Japp, who discusses the mysterious death of American chess champion Gilmour Wilson during a match against Dr. Savaronoff. Poirot deduces that Wilson was electrocuted via a rigged chess piece and table, orchestrated by the Big Four. He identifies the niece Sonia Daviloff as an agent and the servant Ivan as Number Four, leading to a chase.
Chapter 12
The Baited Trap
Hastings receives a telegram that his wife Cinderella has been kidnapped by the Big Four. A note from the gang orders him to follow a Chinese messenger without leaving word for Poirot, on pain of his wife's safety. Hastings leaves a subtle clue for Poirot by disarranging books and coals, then follows the guide through London's East End to a hidden subterranean chamber where a servant of Li Chang Yen confronts him.
Chapter 13
The Mouse Walks In
Hastings is captured by the Big Four and forced to write a letter luring Poirot into a trap, with the threat of his wife's torture as leverage. He attempts to warn Poirot through coded signs (four books, coal arrangement). Poirot, understanding the warning, arrives prepared with a smoke bomb and police backup, rescues Hastings, and captures the operatives. Hastings collapses in despair over his wife's continued captivity.
Chapter 14
XIV: The Peroxide Blonde
Poirot and Hastings investigate the Chinatown premises after a gas bomb attack, finding only character notes about themselves. Poirot deduces that Number Four is an actor. They meet Flossie Monro, who gives them a photograph of Claud Darrell. Despite Poirot arranging protection, Flossie is killed in a hit-and-run. They find her flat ransacked and an empty frame with a new label, leading Poirot to conclude that Number Four is Claud Darrell.
Chapter 15
XV: The Terrible Catastrophe
Poirot reveals the existence of the Big Four to the Home Secretary and the French Premier, detailing their identities and aims. Despite skepticism, he warns of the threat and prepares for his own death. Later, a bomb disguised in a matchbox kills Poirot, but Hastings survives, vowing to continue his work.
Chapter 16
The Dying Chinaman
Hastings, reeling from Poirot's apparent death, is consumed with guilt and a desire for vengeance against the Big Four. Despite warnings from Dr. Ridgeway and the Home Secretary to return to South America, he resolves to continue Poirot's work. He places advertisements seeking information on Claud Darrell, but learns of John Ingles's mysterious disappearance at sea. Countess Rossakoff delivers a second warning for him to leave England, hinting at a third and final warning from 'the Destroyer.' Hastings then receives a call from St. Giles's Hospital about a dying Chinaman who had his name and address. At the hospital, he learns the man was Ingles's servant. The Chinaman, before dying, whispers cryptic Italian words—'Handel's Largo' and 'carrozza'—leaving Hastings bewildered and suspicious of a trap.
Chapter 17
Number Four Wins a Trick
Poirot and Hastings, in hiding in the Ardennes, await news of the Big Four. Poirot reveals his plan to gather all four members together for a final strike. Hastings recounts the dying message from Ingles's servant, which Poirot interprets as a clue to the Big Four's meeting place at Karersee. Captain Harvey arrives with intelligence that Li Chang Yen has isolated China, and Abe Ryland and Madame Olivier are moving toward Italy. Poirot and Hastings travel to the Italian Tyrol, where Poirot deliberately reveals himself to Number Four at dinner, hoping to provoke a reaction that will lead to the final confrontation.
Chapter 18
In the Felsenlabyrynth
Hastings and Poirot (actually Achille Poirot in disguise) are captured by Number Four and brought to the underground headquarters of the Big Four, where they confront Ryland, Madame Olivier, and the absent Li Chang Yen. The Countess Rossakoff exposes the disguise, but Achille reveals that a cordon of detectives has surrounded the mountain and that hounds are following an aniseed trail to their entrance. As the net tightens, Madame Olivier hints at a final destructive escape. Later, after an explosion, Hastings awakens to find the real Poirot, who explains his elaborate ruse—including faking his own death, impersonating his 'twin brother' Achille, and using the countess's lost child to win her over—leading to the apparent destruction of the Big Four and Li Chang Yen's suicide.
