The deserted island hotel hides a dark and sinister secret. Hundreds of years ago a witch held sway there, dominating her coven and spreading an evil that has seeped deep into the earth. Two centuries later, a photographer and his virginal fiance sneak onto the island to research its gruesome history. Soon all will find themselves fall...

A woman is married to the son of a doctor, the proprietor of a private sanatorium, where she is under unwilling treatment. Both the son and the doctor indicate they want the marriage dissolved. Arriving at the scene is a mysterious personage identified as the doctor's brother who formerly was a stage magician in Europe. He is accompani...

Dr. Tony Flagg's friend Steven has problems in the relationship with his fiancée Amanda, so he persuades her to visit Tony. After some minor misunderstandings, she falls in love with him. When he tries to use hypnosis to strengthen her feelings for Steven, things get complicated.

Lost Caverns Hotel bellhop Freddie Phillips is suspected of murder. Swami Talpur tries to hypnotize Freddie into confessing, but Freddie is too stupid for the plot to work. Inspector Wellman uses Freddie to get the killer (and it isn't the Swami).

A mysterious hypnotist (Chester Morris) reverts his beautiful assistant (Marla English) back into the form of a prehistoric sea monster that she was in a past life.