Evil Under the Sun

Hercule Poirot (Sir Peter Ustinov) is called in to investigate a case for an insurance company regarding a dead woman's body found on a moor, and then an important diamond sent to the company to be insured, turns out to be a fake. Poirot discovers that the diamond was bought for Arlena Marshall (Dame Diana Rigg) by Sir Horace Blatt (Colin Blakely),and Arlena is on her honeymoon with her husband and stepdaughter on a Mediterranean island hotel. He joins them on the island and finds that everybody else starts to hate Arlena for different reasons, refusing to do a stage show, stopping a book, and for having an open affair with Patrick Redfern (Nicholas Clay),another guest, in full view of his shy wife. So it's only a matter of time before Arlena turns up dead, strangled, and Poirot must find out who it is.