Christie Agatha. Death on the Nile.

A young heiress, newly married, is found murdered aboard the luxurious steamer “Karnak,” sailing down the Nile. It soon becomes clear that she had many enemies among the passengers. Anyone could have killed the arrogant and self-assured young woman who had stolen her best friend’s fiancé. Yet none of the likely suspects seem to have committed the crime…

Fortunately, the great detective Hercule Poirot is also on board. He knows many of the passengers from London society and is well aware of the possible motives each one might have.

Naturally, the first thing the Belgian sleuth considers is a love triangle — the murdered woman, her newlywed husband, and the passionate woman he abandoned for the rich heiress…