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...

Two mysterious events, both surrounding valuable diamonds, occur a decade and an ocean apart. Can a jeweler's assistant uncover the truth?

A farm boy betrothed to a socialite falls in love with his maid - an impoverished girl from the marsh.