After a detective is assaulted by thugs and placed in an asylum run by Professor Baum, he observes the professor's preoccupation with another patient, the criminal genius Dr. Mabuse the hypnotist. When Mabuse's notes are found to be connected with a rash of recent crimes, Commissioner Lohmann must determine how Mabuse is communicating with the criminals, despite conflicting reports on the doctor's whereabouts, and capture him for good.

1959 film by Wolfgang Schleif

Old Karl Knesebeck has long been head waiter and rules his waiters with an iron fist at the hotel. When the business passes into the hands of the heirs after the owner's death, he's in a difficult position. The unscrupulous Alwin makes advances toward Niddy, the owner's daughter, whose well-being Knesebeck watches over like a father. Alwin demotes the old man to toilet attendant — a tragedy that Knesebeck tries to salvage, especially since Niddy is about to marry Alwin and another man would actually be better for her...