Ruth Raymond works on the telephone switchboard of a large NYC office building. One day, a private detective informs her that she is actually the daughter of railroad tycoon Luke Carson, and that she had been kidnapped as a baby 14 years ago by Luke's vindictive brother Elwood, and placed with strangers.
The owner of a large mansion in the country throws a costume party for some of his friends. However, the party turns sour when he is found stabbed to death in a closet.
Herman Brandt, a handsome but overly conceited actor, lives in the same apartment building in Vienna as Carola and John Pointer and their 18-year-old daughter Mariette.
While streetworker Mickey romances Minnie, Mickey's nephews Morty and Ferdie take control of his steamroller and it's full speed ahead on a very destructive ride.