This is the best book so far and likely to remain so, about British naval intelligence in World War II. Unlike its predecessors it does not deal merely with how the intelligence was gathered but also with how it was used. --Guardian
'This book is a real treat for anyone interested in this vital part of the Naval War during WWII and is really well written by a man who is clearly an authority on the matter. Certainly one of the best books on the matter ever written. .. highly recommended.' --U-Boat Net --This text refers to the Paperback edition.
Patrick Beesley served in the Naval Inteligence Division of the Admiralty, in the Operational Intelligence Centre, from 1940 to 1945. His other books include Very Special Admiral, a biography of Admiral John H. Godfrey. --This text refers to the Paperback edition.