Rich oddball Frederick Loren (Vincent Price) has a proposal for five guests at a possibly haunted mansion: Show up, survive a night filled with scares and receive $10,000 each. The guest of honor is Loren’s estranged wife, Annabelle (Carol Ohmart), who, with her secret lover, Dr. Trent (Alan Marshal), has concocted her own scheme to scare Loren’s associate, Nora Manning (Carolyn Craig), into shooting the potentially crazy millionaire. But more spooks and shocks throw a wrench into the plan.