Eccentric Frederick Loren (Vincent Price) and his wife have invited 5 guests to a "house" party at the mysterious mansion on Haunted Hill, which is reported to be inhabited by evil spirits. Each guest is given a small coffin holding a gun and is informed that those who remain in the house until sunrise will receive $10,000. Frights and thrills fill the night as nerves are put on edge and the guest's secrets start coming to light.