They thought their war was over when they were plucked from the sea.
Not quite. Captive German sailors were washed, fed, clothed, and brought to remote country houses where naval intelligence deftly drained vital information from their heads.
We follow the interrogators’ growing confidence and expertise, from their first hesitant steps in World War 1 to their part in dismantling one of the most vicious regimes the world has seen. The system yielded intelligence which preserved countless merchant seamen’s lives, as the once-terrifying U-boats progressively turned into their own crews’ iron coffins.