The great Dr. Pfeiffer plays the little Primaner Pfeiffer. As the successful playwright Dr. Hans Pfeiffer, he is planning a play about school. In order to gather material, he takes the place of his brother, who is a primary school pupil. The seasoned doctor finds pleasure in the craziest of pranks, while his brother tries to fill the role of theater man in the big city. And then love intervenes for both of them.
Fernand has escaped from prison and finds shelter in the traveling circus Barlay, where his former wife Flora works as a predator trainer. Their son, now grown up, Marcel is an art rider and does not know that Fernand is his father. Marcel loves Yvonne, the daughter of director Barlay. He is against the connection, sends his daughter to Italy and convinces Marcel that Yvonne does not return his feelings.
