Teenagers gathered in an old mansion are being murdered one by one. The survivors must discover who among them is the killer before he finishes off everybody.
The Haunted House of Horror is a 1969 British horror film directed by Michael Armstrong and starring Frankie Avalon and Jill Haworth. it was written by Armstrong and Gerry Levy. Young adults look for a thrill by spending the night in an old mansion in the English countryside. The film's tagline was "Behind its forbidden doors an evil secret hides!"