Wealthy John von Zwenken (Louis H. Chrispijn) lives with his daughter and son-in-law in a castle named De Werve.

Twelve years later, young Frans (Lily Bouwmeester) lives an unusual life, having been raised as a boy by John and sgt.

Meanwhile, the Colonel receives a visit from his son Rudolf (Willem van der Veer), who has been living a joyful but expensive student life in Leiden).

As a consequence, Frans (now Annie Bos) is sent to a boarding school, where she spends her years showing rebellious behavior against her superiors.

After a warm welcome, she finds out that her grandfather is no longer able to afford the castle, so she proposes to raise money by organizing a fox hunt.

A De Werve member has been condemned a scandal, so Frans makes it her goal to help him escape, on condition that he passes the border and never returns to the Netherlands again.

However, when she misinterprets that Leo will inherit all of Roselaar's money while the Von Zwenkens remain ignored, she becomes furious, until finding out that her grandfather has died of old age.