The Invisible Army (1945)

Denmark is under German occupation, and the young couple Alice and Poul must live separately. Poul is part of the resistance movement's invisible army and stays in England, while Alice lives with her mother and is drawn to Poul's friend Jørgen. As Poul shows up with plans for sabotage under his arm and the Gestapo on his heels, the seriousness of both war and love increases.