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Mark Easterbrook, a historian, accidentally witnesses a fight in a London cafe where a girl pulls out the hair of Thomasina Tuckerton, who soon dies mysteriously. At dinner with friends, Poppy Stirling mentions a "white horse" – an entity associated with the organization of death – and dies herself shortly afterwards.

Priest Father Gorman receives a confession from the dying Mrs. Davis with a list of names and a secret, but is killed in the fog; the list is in his shoe. Mark, learning that the list includes names such as Tuckerton, his godmother Lady Hesketh-Dubois and himself, fears that he is predicting deaths and embarks on an investigation with the help of police surgeon Jim Corrigan and writer Ariadne Oliver.

In the village of Much Deeping, at cousin Rhoda Despard's party, she hears whispers about the Pale Horse - an old inn turned into the home of three "witches": Thyrze Grey, Sybil Stamfordis and Belle Webb, who practice black magic and supposedly kill at a distance. He meets the suspicious Venables in a wheelchair and the pharmacist Osborne.

With the support of Dana Calthrop, the vicar's wife, and the young woman Ginger Corrigan, who becomes his ally and romantic interest, Mark infiltrates the mystery. Ginger befriends Poppy and gets clues about "favors" and death bets, leading them to a ritual at the Pale Horse where Ginger begins to fall ill.