The film begins with a meeting between wealthy heiress Linnet Ridgeway (Lois Chiles) and her close friend Jacqueline de Bellefort (Mia Farrow). Jackie wants her fiancé, Simon Doyle (Simon MacCorkindale), to work for Linnet. But he and Linnet have a whirlwind affair and end up marrying. While honeymooning in Egypt, they are continually hounded by a jilted Jackie. In an attempt to get away, the Doyles board a Nile paddle steamer, the S.S. Karnak.