A new adventure for Major Dalby and his young sidekick Sergeant Mackenzie May 1940: the 'phoney' war is about to come to an end. The head of the German Secret Service is attempting to flood the UK with spies and Dalby and Mackenzie are determined to uncover them. On May 10th France is invaded and the British army retreats to Dunkirk. In a race against time, Dalby and Mackenzie hatch a daring plan: they will destroy the brothel in Dunkirk from which...