Twenty years ago, a little accident with a guillotine trick left magician Duke Duquesne's wife/on-stage assistant without a head and their baby daughter, Cassie, without a mother. Now, The Great Duquesne may have another trick up his sleeve. He dies, leaving Cassie a sizable inheritance if she spends seven nights in his spooky mansion. With a fearless young reporter by her side, Cassie braves terrors that could be the work of evil spirits. Or are they illusions dreamed up by Cassie's dear demented dad? Connie Stevens, Dean Jones (in his pre-The Love Bug days) and Cesar Romero star in a creepy horrorfest that offers scares, screams, a return of that guillotine and Max Steiner's (Gone with the Wind) penultimate score.