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At a party, thirteen-year-old Joyce Reynolds boasts that she witnessed a murder several years ago, but no one takes her seriously. Soon after, Joyce is found dead, drowned in a tub of apples. The astute detective Hercule Poirot is called in to solve the case, aided by his friend Ariadne Oliver, a crime writer. Poirot investigates Joyce's claim, questioning the townspeople and uncovering a series of secrets connected to the town's past crimes.

The plot focuses on the complex relationships between characters, including a schoolteacher, a local doctor, and the victims' families. Poirot discovers that Joyce may have known too much about an old case involving a disappearance, a forged will, and ulterior motives. Through conversation and deduction, Poirot connects the clues, uncovering a killer whose motives are driven by greed and fear of exposure.

The novel explores themes of innocence, the evil hidden behind the facade of bourgeois life, and the power of the past to influence the present. Christie skillfully builds suspense, using the Halloween atmosphere to create a spooky atmosphere. Poirot's genius comes to the fore in solving the intricate case, and the ending brings an unexpected twist, characteristic of Christie.