Lilian Harvey plays a young heiress in long-ago France named Madelon who is raised by her grandfather as a boy in order to frighten away fortune hunters. But when the old man dies, her guardian Cesaire wants to marry her off to the rich prefect Barberousse. She is tricked by Cesaire with the portrait of a young man (Viktor von Staal) which is presented to her as that of her future husband. But when Madelone discovers this scheme she flees, again in men's clothing. But on her route to escape, she meets the young man from the portrait and falls in love with him. But Madelone can't give up her disguise right now...

The delightful Johann Strauss comic opera Die Fledermaus was mercilessly lampooned in this truly bizarre production. For starters, a framing device has been added: After appearing in 300 consecutive appearances of Fledermaus (which translates as The Bat) the lead tenor (Georg Alexander) imagines that he's seeing bats everywhere. Driven a bit over the edge by all this, he falls asleep and has a nightmare about the opera, with a group of non-singers cast in the leading roles. The original libretto about romantic assignations, political imprisonments and mistaken identity is burlesqued to the hilt: at one point, the hero finds out that his prison cell is surrounded by rubber tubes!

Silent epic on the final years of Frederick II.