Rent Death on the Nile (2004)

Jacueline de Bellefort (Emma Griffiths Malin) introduces her fiancee Simon Doyle (JJ Feild) to Linnet Ridgeway (Emily Blunt), a rich and beautiful American heiress in the hope of finding him a job. However, Linnet seduces Simon and marries him herself. Seeking revenge, Jacqueline follows the couple on their honeymoon cruise along the Nile. When Linnet is murdered, Hercule Poirot (David Suchet), also on the same cruise, sets about solving the baffling case.