Poirot is spending a week-end with the Angkatells, at their country house called The Hollow.

Hercule Poirot finds himself investigating the murder of his dinner host, Mr. Shaitana, who was stabbed in the heart while his guests played bridge.

James Bentley is arrested for the murder of old Mrs McGinty. It looks like an open and shut case, but Superintendent Spence is not convinced. He turns to Poirot for help, and together with Poirot's writer friend Ariadne Oliver they set out to find the real killer.

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.

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.

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.