10-year-old Rosmarin von Stetten lives with his widowed father Robert in the big city. During the holidays one day in the morning Rosmarin goes to the lake near the castle and meets Thymian, the poorest boy of the village, whose mother did not come back from the war and who has to do several jobs in the village for his living. The boys enter a boat, but both fall into the lake. Thymian crawls out of the water first and is found by a servant from the castle, who thinks he is Rosmarin and bring him to the castle and to bed. The boy doesn't know what happens and thinks he's spellbound...
Hans Söhnker
as Robert von Stetten
Edith Mill
as Anna Retzer
Michael Ande
as Rosmarin von Stetten Thymian Retzer
Irene von Meyendorff
as Charlie
Beppo Brem
as Bürgermeister Kunzel
Wastl Witt
as Herr Kramer
Lina Carstens
as Frau Kramer
Willy Trenk-Trebitsch
as Franz
Petra Unkel
as Vroni
Marianne Brandt
as Huberbäuerin
Bruno Hübner
as Dorflehrer
Erika von Thellmann
as Frieda
