An inexperienced U-boat crew has to survive a secret mission and a young German woman is torn between loyalty for her home country and the French resistance in the WWII drama.

The single mother Caterina Schöllack (Claudia Michelsen, 52) takes over the management of the Galant dance school on Kurfürstendamm ("Ku'damm") in Berlin after the end of the Second World War. The father of their three daughters did not return to the family after the war, he is officially missing.