Ironically, at the beginning of the summer holidays, Alwins strict father has grounded him to get him to improve his spelling. Alwin feels like a prisoner and decides to run away heading to his grandparents in the Harz mountains nearly 200 kilometers away. On the road Alwin meets many people and with their help Alwin slowly progresses towards his destination.

At the beginning of the Second World War, Czech music student Honsik comes to Germany from Prague to join a "foreign worker company". After rescuing a boy from the rubble of a bombed-out house, he himself is seriously injured and taken to a hospital in Stralsund. There he is regarded as a second-class citizen and the Germans are preferred to him. Nurse Käthe stands up for him, cares for him and defies all prohibitions. A love affair is kindled between the two, but it is not under a good star. Honsik tries to flee to his homeland with his comrades and Käthe supports him. At the last moment, however, Honsik realizes that his love for Käthe is stronger than his homesickness and makes his way back. Once back home, he can only watch as Käthe is arrested by the Gestapo. With the help of a resistance fighter, the young man from Prague manages to escape after all.

The year is 1940 and Nazi Germany is at the height of its military prowess, having captured most of Europe and eyeing the Soviet Union to the East. The Russian military command suspects hostile intent from Germany and so arranges for its spies to infiltrate ranks of the German military and the SS. Alexander Belov is a Russian spy, who travels from Soviet-held Latvia to Nazi Germany under an alias of Johann Weiss. His mastery of the German language, steel nerves and an ability to manipulate others help him to use his connections in the SS to ascend the ladder of the German intelligence. He uses his position to identify sympathetic Germans, who help him to procure vital intelligence, and to help local resistance movements in their collective fight against Nazism.