The house guests at Styles seemed perfectly pleasant to Captain Hastings; there was his own daughter Judith, an inoffensive ornithologist called Norton, dashing Mr Allerton, brittle Miss Cole, Doctor Franklin and his fragile wife Barbara , Nurse Craven, Colonel Luttrell and his charming wife, Daisy, and the charismatic Boyd-Carrington. So Hastings was shocked to learn from Hercule Poirot's declaration that one of them was a five-times murderer. True, the ageing detective was crippled with arthritis, but had his deductive instincts finally deserted him?

The novel features Hercule Poirot and Arthur Hastings in their final appearances in Christie's works. It is a country house novel, with all the characters and the murder set in one house. Not only does the novel return the characters to the setting of her first, The Mysterious Affair at Styles, but it reunites Poirot and Hastings, who last appeared together in Dumb Witness in 1937. It was adapted for television in 2013.