Hamburg ship captain Markus Jolly is hired to transport a vaccine to a Latin American port, but when the precious cargo is stolen by mobsters, he is falsely accused of engineering the theft.

Mommsen Gymnasium director Taft secretly places his nephew as a spy with the difficult class of Pepe Nietnagel. During the celebration for the 100th anniversary, a simulated fire forces the school to shut down for a week. The director's attempt to get a tough teacher assigned by the department of education results in the exact opposite because of Nietnagel's intervention.