Classic British thriller adapted from Agatha Christie's novel. When beautiful socialite Arlena Marshall (Diana Rigg) is found strangled on a Mediterranean island, there is no shortage of suspects for Hercule Poirot (Peter Ustinov) to eliminate from his enquiries. With Arlena having made a number of enemies in her time on the island, Poirot faces a tough task to solve the case and find the killer. The cast also includes Maggie Smith, Colin Blakely and Jane Birkin.