One evening, Hercule Poirot dinners in a London restaurant. His table is next to that of a young couple apparently very fond of love, Jackie de Bellefort and Simon Doyle. A few weeks later, on a cruise on the Nile, the great detective is surprised to find Simon Doyle married to Linett Ridgeway. Knowing that Jackie is ingenious about crossing the path of the young couple, Hercule Poirot feels the tragedy coming fast and he's afraid...