Set in the summer of 1917, the story follows the war-wounded Captain Arthur Hastings to the Styles St. Mary estate of his friend John Cavendish. The Cavendish household is wrought with tension due to the marriage of John's widowed mother to a suspicious younger man. Hastings runs into his old friend Hercule Poirot In the village. When the estate's trouble turns deadly, the friends unite to solve a most baffling case.

Just after World War One, Tommy Beresford and Tuppence Cowley are desperately short of money. With few jobs available, they decide to form a partnership, hiring themselves out as "young adventurers, willing to do anything, go anywhere." In their first assignment, Tommy and Tuppence must use all of their ingenuity to save not only their own lives, but the life of a mystery woman named Jane. Where is Jane Finn? The mere mention of her name produces...