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The story begins when Dr. Arthur Calgary, a geologist, visits the Argyle family to discover that Jacko Argyle, convicted of the murder of his mother Rachel Argyle, has died in prison. Calgary brings evidence that Jacko was not the culprit, as he was with him at the time of the crime. This discovery shakes the family, who had already come to terms with Jack's guilt.

The Argyle family, wealthy but dysfunctional, consists of widower Leo, his children (mostly adopted), and their housekeeper Kirsten. All had motives for the murder of Rachel, a woman who was dominant but also manipulative. Calgary's discovery creates tension because it means that the real killer is still among them. Each member of the family becomes a suspect, and old secrets, including jealousy, financial fraud, and hidden relationships, come to the surface.

As the family struggles with guilt and mutual accusations, Calgary investigates with the help of several family members, uncovering a complex web of lies. The novel culminates in the discovery of the real killer, whose motives are driven by deeply hidden emotions and a desire for revenge.

Christie explores the psychological consequences of injustice and how the truth can destabilize lives. The novel is suspenseful, with an emphasis on characters and moral dilemmas, rather than a classic detective investigation.