Hans Schwarz Jr.

Strange things happen in a revue theatre. The dancer Maria seems to be hunted by an invisible admirer. When the body of a probable FBI agent is found in a trunk the police asks FBI man Joe Como for help. Como gets interested in the revue theatre and an ominous transport firm soon. When he is receiving mysterious threatening letters he is sure that Dr. Mabuse has risen again. But what is going on at "Enterprise X" so that both the goverment and the mad genius in crime are interested in it? (imdb)

When her widowed father remarries, Maria is mistreated by her wicked new stepmother and meddlesome stepsister. One day while walking in the forest, Maria meets a handsome Prince disguised as a hunter. He leaves her with a garnet necklace as a memento of their chance encounter and a symbol of his undying love. But alas, the necklace has fallen down a well and the two sisters plunge headlong into a magical world beneath the water to retrieve it. (imdb)