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With the renewed interest in wartime intelligence, a timely history of radio intercepting answers the question of how enemy messages are detected in the first place. The focus is on the early war-shortening Y and Radio Intercept Services, and their brilliantly clever inventors and technologists who proved to be unsung heroes with headphones clamped to their ears.

Beaumanor Hall during WWII was set up as a wireless intercept station, one of many. These stations were important in that they 'produced the flow of enemy messages to the cryptographers at Bletchley Park". Nicholls (Nixon) served as a Special Wireless Operator at Beaumanor from 1942-1945 and this book provides a look at the work done at that time, the place and the staff.