This book investigates the crucial role of British codebreaking efforts, particularly the decryption of German U-boat communications, in the Battle of the Atlantic. It examines the intelligence gathered from the Enigma machine and its impact on naval strategy, exploring the challenges faced by the codebreakers and the vital information they provided to Allied forces. The narrative focuses on the operational use of this intelligence and its direct contribution to the eventual Allied victory in the Atlantic theatre.

The book is likely to be appreciated by historians and enthusiasts of World War II naval warfare and intelligence operations. Its focus on the practical application of Enigma decrypts in the Battle of the Atlantic suggests a detailed and operationally-oriented narrative. The inclusion of National Archives material indicates a strong reliance on primary source documentation, promising an authoritative perspective on the subject.