Nightmare — Dell Shannon

It was strictly a duty call and Pat Carroll wasn't looking forward to it one bit. But she was in Wales and her fiance's family lived nearby. He was dead now, killed in an accident, and Pat felt that since she was so close to his family's home she should pay her respects to the woman who would have been her mother-in-law. It would be a bore, but it was the least she could do. And, besides, it was only for a day or two. But the day or two dragged on and Pat found herself the helpless prisoner of a fanatic madwoman. Locked in a hideous room, she was trapped in an infinite eternity of a waking nightmare . . .

'A great suspense shocker in the icy horror tradition of Psycho' Boston Herald