Vincent Price has one of his juiciest roles in this haunted-house thriller as millionaire playboy Frederick Loren, who invites five guests out to a genuine haunted house, offering them each $10, 000 if they spend the night. Elisha Cook Jr. plays one of the guests, a nervous alcoholic who has been in this house before and witnessed some terrible things. Mr. Loren's beautiful but treacherous wife (Carol Ohmart) is also present - and might be out to kill Frederick during the course of the evening; then again, he might be out to kill her.