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The story takes place in the English country home of the Argyle family. Two years earlier, Rachel Argyle, a wealthy philanthropist, was murdered, and her adopted son Jacko was convicted of the crime. Jacko dies in prison, but Dr. Arthur Calgary, a scientist who claims to have proof of Jack's innocence, appears, having provided him with an alibi that night.

Calgary's arrival shakes the Argyle family, as it reopens a painful past. All the members - widower Leo, his secretary and future wife Gwenda, adopted children Mary, Michael, Tina and Hester, and housewife Kirsten - become suspects. Each of them has a motive: money, jealousy or hidden resentment towards Rachel, the domineering mother. As Calgary investigates, he uncovers a web of lies, repressed emotions and family tensions. The tension grows as the truth about the killer threatens to destroy the fragile family balance.

Christie masterfully constructs a psychological drama, focusing on the consequences of guilt and innocence. The novel is not a classic detective story, but an exploration of moral dilemmas and questions: is it better to leave the past buried? The denouement is unexpected, revealing a killer whose motives are driven by deeply hidden emotions.