The bomb blast causes many casualties and, as martial law is imposed. Douglas forges papers to take his son to the safety of the unoccupied zone with his neighbour Joyce Sheenan. Returning to work he discovers that Harry has been arrested as a Resistance member but is able to secure his release. Barbara reintroduces him to Sir Robert Benson's group where he learns they are planning to join with the German army in blowing up the bomb factory and freeing the king but need his cooperation. Having sheltered Sylvia after she has escaped from the detention camp he is called to another murder scene, the victim this time being Bernard Staines, a member of Benson's covert Resistance party. Before he can fulfill his obligation he is told that Barbara has been taken by the Germans.
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Did You Know?
Some of the ambulances have Royal Air Force markings, suggesting the Germans used captured British equipment after the invasion. See more
When Archer examines the film he's been given, it is clearly modern colour film. Back then it would have been black and white, and if it were actually colour, it wouldn't have been possible to process it at home. See more