The novel features her novelist detective Ariadne Oliver as a minor character, and reflects in tone the supernatural novels of Dennis Wheatley who was then at the height of his popularity. The Pale Horse is mentioned in Revelation 6:8, where it is ridden by Death.
A dying woman, Mrs Davis, gives her last confession to Father Gorman, a Catholic priest, but along with her confession she gives him a list of names and a terrible secret. Before he can take action, however, he is struck dead in the fog. As the police begin to investigate, a young hero begins to piece together evidence that sets him upon a converging path.