The film is based on the true story of Norway’s most colourful resistance fighter Max Manus, and follows him from the outbreak of World War II until the summer of peace in 1945. After fighting against the Russians during the Winter War in Finland, Max returns to a German-occupied Norway. He joins the active resistance movement, and becomes one of the most important members of the so-called “Oslo Gang”, famous for their spectacular raids against German ships in Oslo harbour.