aka Sleep No More. Kimberley Prescott (Anne Baxter) is the heiress of a South African diamond company and grieving after her father’s recent suicide at the family’s villa outside Barcelona. She is shocked by the arrival of a man (Richard Todd) claiming to be her brother Ward, believed to have died in a car accident in South Africa a year earlier. Kimberley had identified his body. He insinuates his way into her home accompanied by a woman claiming to be a housekeeper, Elaine Whitman (Faith Brook) after giving the Spanish maid the weekend off. Kimberley has trouble convincing her friends and family and the local police inspector Vargas (Herbert Lom) that a complete stranger has taken her deceased brother’s identity and appears to know events of their shared childhood and suspects he is after her father’s estate … Written by David D. Osborn and Charles Sinclair, this highly efficient B thriller is a convincing mix of the paranoid woman’s film and murder mystery, with an enormous stash of diamonds at the centre of the plot. Baxter offers a pleasingly vivid performance as the woman being driven to the edge of sanity with nice guy actor Todd playing it sinister and clearly enjoying himself. The guitar score by Mátyás Seiber is performed by Julian Bream. Produced by Douglas Fairbanks Jr. and directed by Michael Anderson with cinematography by his usual collaborator, Erwin Hillier.