Poirot stumbles on the murder scene of philandering Dr Christow in a country house as his wife standing next to him with a revolver in her hand.

A wealthy British heiress honeymooning on a Nile cruise ship is stalked by a former friend, whose boyfriend she had stolen before making him her new husband.

Elinor Carlisle seems to be the obvious murderer of her ailing aunt and the beautiful romantic rival who broke up her engagement, but Poirot uncovers darker motives.

Lucy Crale enlists Poirot to investigate the 14-year-old murder in which her mother was hanged for poisoning her artist father.