When Oliver Phenwick travels to Bavaria to dispose of the castle he has inherited, he and his group fall prey to a manical killer. Undaunted, Oliver remains determined to trap the anonymous culprit who keeps threatening his wife, Letita. So he hires the pretty young Belinda to impersonate her. But Oliver has no idea that Belinda's life will soon be endangered by someone in their midst. Nor does he know that she will be taken hostage at the will of an evil hypnotist...