Private eye Dold, a specialist in surveillance tasks, is sent to investigate a Frankfurt bordello boss. He's a pain in the butt for many in the red-light district and is to be overthrown to pave the way for financially strong speculators to lucratively redevelop the area. Dold, who always saw his work as morally justified, comes to doubt the rightness of his actions far too late.
A beautiful princess is betrothed to the prince of a neighboring kingdom, and when the time comes, she sets out with a small entourage to wed him. She is given a magic handkerchief by her mother, which she is told will protect her, along with a talking horse. Before she departs, her mother entrusts her to the care of her chambermaid, who promises to look after her. Unknown to the queen, however is the fact that the chambermaid desires the prince for herself, and has been concocting an evil plan to accomplish her ends. With the reluctant help of two bumbling servants, the chambermaid deprives the princess of the magic handkerchief, and tricks her into changing places with her, swearing her to secrecy. Once they arrive at the palace, the maid is taken for the princess, who becomes a goose girl.