A millionaire playboy offers a substantial sum to anyone who can survive a night in his notoriously haunted mansion. Frederick Loren, a wealthy eccentric, invites a group of strangers to his isolated estate, promising them $10,000 if they can endure twelve hours within its walls. The house, however, is filled with spectral inhabitants and sinister secrets, and the guests soon find themselves battling not only their fears but also each other as the night progresses.

This classic horror film is often cited for its atmospheric tension and Vincent Price's iconic performance. The premise of a haunted house challenge has been a staple of the genre, and this film is a notable early example. Critics have pointed to its suspenseful build-up and the psychological elements at play as key strengths. While some aspects may reflect the filmmaking conventions of its era, its enduring appeal lies in its effective use of suspense and its memorable central character.