During a bombing attack, Bob and Carol discover that one of the members of the peace group, Trapes (Frederick Cooper), is distributing leaflets. Carol later tracks Trapes down to an air raid shelter where he admits he was wrong. However, when Trapes tells his superiors at the peace group of his change of heart and they arn't too pleased. While Trapes is a misguided idealist, it turns out the others in the group are Nazi agents...
At times this is a tough and realistic film which uses actual footage (then fairly recently shot of course) of bombed and burning buildings in London. Of course, due to the propaganda, everyone has the stiffest of lips and accept the destruction of everything they have held dear with a suitably chipper or matter-of-fact attitude. The Nazi agents, including Andre Morell, are also suitably sinister looking. Basil Radford plays an excellent role as the unflappable newspaper editor.