This film continues the story of radio operator Ludwig Bartuschek from “The Sailor’s Song”. Near the end of the Weimar Republic, Bartuschek (Erwin Geschonneck) is working as a mechanic in the Sperber airplane plant. Director Dehringer offers him the opportunity to train as an airplane constructor if he is willing to give up his communist beliefs under oath. Bartuschek will not allow himself to be bought and instead joins the underground resistance movement.

Erwin Geschonneck
as Bartuscheck

Wilhelm Koch-Hooge
as Dr. Lampert

Hilmar Thate
as Henne

Franz Kutschera
as Dr. Dehringer

Rosita Fernandez
as Ines

Otto Dierichs
as Dr. Klinger

Fred Mahr
as Friedrich

Mathilde Danegger
as Mutter Friedrich

Brigitte Krause
as Betty Bartuscheck

Friedrich Teitge
as