1941 is a dark year for the countries of the anti-Hitler coalition. German troops are advancing on the territory of the USSR, Great Britain unsuccessfully sends more squadrons of bombers across the English Channel, and almost the entire rest of Europe is occupied by the Nazis. However, even there, under Hitler’s boot, the Resistance movement is alive - a movement in which Denmark occupies a special place. Sabotage, acts of sabotage, collection of information, operations to rescue Jews - Danish underground fighters bravely fight the occupiers. But now one of the groups has been defeated. Its participant Arne Olafsen, who became the owner of incredibly important photographic film for British intelligence, which depicts the location of the powerful Freya radar, died, barely having time to transfer the materials to his younger brother, eighteen-year-old Harald. And now Harald and his friend Karen intend to do the impossible - transport the film to England at any cost...