While on holiday in Aswan to board the steamer Karnak, set to tour along the Nile River from Shellal to Wadi Halfa, Hercule Poirot is approached by successful socialite Linnet Doyle née Ridgeway. She wants to commission him to deter her former friend Jacqueline de Bellefort from hounding and stalking her. Linnet had recently married Jacqueline's ex-fiancé, Simon Doyle, which has made Jacqueline bitterly resentful. Poirot refuses the commission and unsuccessfully attempts to dissuade Jacqueline from pursuing her plans. Simon and Linnet secretly follow Poirot to escape Jacqueline but find she had learned of their plans and boarded ahead of them. The other Karnak passengers include Linnet's maid Louise Bourget; her trustee Andrew Pennington; romance novelist Salome Otterbourne and her daughter Rosalie; Tim Allerton and his mother; elderly American socialite Marie Van Schuyler, her cousin Cornelia Robson and her nurse Miss Bowers; outspoken communist Mr Ferguson; Italian archaeologist Guido Richetti; solicitor Jim Fanthorp; and Austrian physician Dr Bessner. =