Mike Church is a Los Angeles private detective who specializes in finding missing persons. He takes on the case of a mute woman who is suffering from a total amnesia and doesn’t even know her name. She keeps having nightmares involving the murder of a pianist, Margaret, by her husband Roman Strauss in the late 1940s. In an attempt to solve the mystery about her identity and her nightmares, Church accepts the help of an antiquary who arrives to offer his services as a hypnotist. The hypnosis sessions soon begin to reveal some surprises.