An ailing Poirot returns to Styles with Hastings nearly three decades after solving their first mystery together there in order to prevent an unscrupulous and ingenious serial killer from claiming more victims.

Beside the bodies of three murder victims lies a copy of the ABC Railway Guide.

Lucy Crale hires Poirot to solve the murder of her father sixteen years before, and Poirot finds a number of possible suspects who are still alive.

Poirot returns to Belgium for the first time since the Great War. There he revisits a twenty-year-old murder mystery that was never officially solved.

Poirot and Hastings take a holiday in Cornwall, looking for peace and quiet. They meet Miss Nick Buckley, who lives near their hotel at End House, and she tells Poirot she has had three near-fatal accidents in a few weeks. He then finds a bullet hole in her hat, returns with her to End House and is drawn into a complex murder investigation.....

In an effort to recover his confidence after a rare professional failure, Poirot sets off for the Swiss Alps in pursuit of a missing maid.

Poirot's Christmas is interrupted by Simeon Lee, who believes his life is threatened. Simeon is soon killed and his diamonds stolen.

Poirot and Hastings are at Lake Windermere for an attempt on the world speed-boat record. An elderly widow is hurt by falling down stairs, then later killed by poisoning with phosphorus.

After collapsing with heart problems, Hercule Poirot visits a seaside health farm on Burgh Island. While there, the flirtatious heiress Arlena Stewart is found strangled on a secluded beach.

Young Elinor Carlisle, engaged to marry the dashing Roddy Winter, finds herself charged with the fatal poisoning of Mary Gerrard, her rival in love. Poirot has the job of saving Elinor, but the evidence against her is overwhelming.

A wealthy British heiress honeymooning on a Nile cruise ship is stalked by a former friend, whose boyfriend she had stolen before making him her new husband.

Hercule Poirot's solicitor, Gilbert Entwhistle, asks Poirot to help solve a riddle and a murder.

Poirot investigates the murder of a shady American businessman stabbed in his compartment on the Orient Express when it is blocked by a blizzard in Croatia.

Poirot investigates a strange and gruesome murder of an elderly psychiatrist. Ariadne Oliver is pressed to try and uncover the truth behind two decade-old deaths. They soon find out that their separate investigations are linked and work together to try and solve the mystery.

Recovering from the horrors of World War I, British Army officer Arthur Hastings hopes to find peace and quiet at a country manor in the English countryside. But when the matriarch dies during the night from strychnine poisoning, Hastings enlists the help of an old friend staying nearby with other war refugees to help solve the murder: former Belgian police detective Hercule Poirot.

Lady Edgware has a dilemma in that her husband has consistently refused to give her a divorce. She asks Hercule Poirot to visit the man and see if there is any possibility of convincing him. When Lord Edgware is found dead, there is no great surprise, but there are a good number of suspects.

Poirot finds a connection between a recent murder and a revolution in the Middle Eastern kingdom of Ramat.

Four clocks surround an unidentified corpse in a blind woman's house, and a young typist is summoned to the crime scene. However, Poirot is convinced that the complicated setup is merely hiding a simpler solution.

Ariadne Oliver is asked to devise a murder hunt for a Devon fête, but her sense of foreboding summons Poirot to the scene. Her fears are realized when, during the fête, the girl playing her murder victim winds up well and truly murdered.

Matthew Davenheim, a rich banker, disappears on a walk from his country house to the village post office, and Inspector Japp of Scotland Yard is put onto the case. Poirot, who has developed an interest in conjuring tricks, bets Japp five pounds that he can solve the mystery without leaving his apartment.

On an airplane, flying from Paris to London, one of the passengers is killed by a poison dart while Poirot sleeps.

Friends and family gather at a dinner party to mark the second anniversary of a woman's death. Meanwhile, Poirot is caught up in a coup d'etat and arrested as a spy, which prevents him from solving a murder at a French restaurant owned by an Italian in Buenos Aires.

Poirot and Hastings are on holiday in Deauville and receive a visit from Paul Renauld, who believes he's being cheated by Chileans. Renauld is kidnapped and his body is later found buried in a new golf bunker. French detective Giraud unwisely challenges Poirot to catch the killer before he can.

During a village's Hallowe'en party, a young girl boasts of having witnessed a murder from years before. No one believes her tale until her body is found later on in the evening, drowned in the apple-bobbing bucket.

Millionaire business man Benedict Farley, a well known eccentric, consults Poirot about bad dreams he has been having. Mr. Farley has dreamed repeatedly of killing himself. Sadly, he does not follow Poirot's advice. When Farley is found dead, Poirot fails to believe that it is suicide and suspects a murder plot relying on hypnosis.