Anthony Asquith directs this wartime propaganda drama. When his actress wife Irena (Diana Wynyard) moves to Berlin to further her career, throat specialist Dr Karl Roder (Clive Brook) decides to accompany her, although he is vehemently opposed to the newly-elected Nazi regime. There he meets Hans Glaser (Derek Farr), a young engineer whose girlfriend has been incarcerated in a concentration camp. Together, they set up their own broadcasting service, Freedom Radio, to denounce the Nazi movement.