Hercule Poirot finds himself trying to solve the mystery of the Cloade family

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.

Three single girls share a London flat. The first works as a secretary; the second is an artist; the third, who comes to Poirot for help, disappears believing she is a murderer.

When a vicar chokes to death on a cocktail while attending a party held by actor Sir Charles Cartwright, Poirot initially dismisses the idea of murder but reconsiders when another guest dies in the same manner.

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.

With the world on the brink of WWII, there is more political turmoil when it appears that the famous Peace Party is in fact a cover for the Big Four.

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.