September 8th 1943, Marshal Badoglio announces the armistice with  the Anglo-Americans troupes. Italian soldiers who don’t want to continue the war alongside Nazi Germany are taken prisoner by the Germans and deported to military prison camps in Germany. Within the Stalag XB of Sandbostel, near Hamburg, a group of Italian officers succeed in building a clandestine radio, Radio Caterina.

Through the radio they catch wind of the Normandy landing, of the Allied advance, and the surrender of the Third Reich.

Isolated in the German prison camp, news from their makeshift radio brings them contact with the outside world, and provides them with hope and strength to withstand the harsh internment conditions. Until liberation.