The Haunted House of Horror

“Behind it's forbidden doors an evil secret hides!”

A group of young people, Chris (Frankie Avalon) and Sheila (Jill Haworth) among them, spend the night in an old mansion in the English countryside, looking for a thrill. Michael Armstrong sends them through the dark rooms of the house, and one by one they start turning up dead. Inspector Bill Bradley (Dennis Price) is on the case, but the survivors have to work out which of them is the killer before the whole group is gone.