Destination Unknown aka So Many Steps to Death

Hilary Craven has lost the will to live, Mrs Betterton is already dead. Then Hilary is asked to impersonate the dead woman and to trace her husband - a missing nuclear scientist - and her will to live returns. A faked air disaster, a string of radio-active pearls, a leper colony floundering in the dry heat of the Moroccan desert. Hilary is lead towards a terrifying discovery and her new found enthusiasm for life turns into ice-cold fear...