This work illustrates some of the steps by which information from intercepted messages in the supposedly unbreakable German Enigma cipher was developed, while providing a candid glimpse of the workings of British intelligence.

Intelligence and National Security- "In the distorting and self-referential discourse of academic intelligence Bennett"s is a compelling if awkward voice of sanity"
Paper Wars, - "another work that is mandatory reading for those interested in a proper understanding of Ultra...This book is the result of the work of a meticulos historian always looking to separate supposition from fact...his efforts to fill in the gaps in intelligence history...must be applauded