Recovering from her grief over the mysterious death of her first love, Peter Allison, Karin marries Walter Bell, Peter's best friend. At first they are happy but soon Walter changes. He becomes silent and forbidding, and absurdly jealous of Peter.

Hoping to prove that she truly loves her husband and not a dead man's memory, Karin returns with Walter to Greece and the home he shared there with Peter and their friend, Simon Ward. But from the moment they arrive, Karin realizes she has made a terrible mistake.

The house is haunted by Peter's ghost. Simon confides to Karin his suspicion that Walter murdered Peter - and will try to kill her. She scoffs at the idea, and to prove her husband's innocence, begins to probe the circumstances surrounding Peter's death. But the more Karin uncovers, the clearer it seems to become - her own husband is a murderer and she is to be his next victim!