Flight Lieutenant Carrington (Robert Wagner) joins the British contingent in Colditz and he is viewed with resentment, especially by Simon Carter (David McCallum) and after they have a scuffle that ends up with the American in solitary, Carrington announces that he wishes to write a book that examines the war from the German point of view. The Gestapo come to interview Carrington and grant permission, but do they trust Carrington – and does he trust them? (thetvdb.com)