Michael (Poul Reichhardt) is in prison, arrested by the Germans, for sabotage during World War II. First he has a flashback, remembering the time up until the sabotage, where the Germans caught him. We follow the resistance group planning and Michael together with his wife Ruth (Lisbeth Movin). The other half of the film is about tracking an informer inside the group that got Michael and several others in prison. Really great performances by all, and a very realistic plot. Notice especially Per Buckhøj's sympathetic prison guard Steinz. Also an underrated score by Sven Gyldmark, that seems very low mixed in the film. It deserves to be heard for real.