Filled with new information from secret British and American files as well as exclusive reminiscences from surviving participants, this book at last tells the full story of how Allied code breakers, aided by heroic sailors and spies in the field, cracked Germany’s "uncrackable" Enigma code–and changed the course of the war.

"In a crowd of books dealing with the Allied breaking of the World War II cipher machine Enigma, Hugh Sebag-Montefiore has scored a scoop."–Washington Post

Hugh Sebag-Montefiore (London, UK) is a lawyer and journalist who has written for the Sunday Times, the Observer, and the Independent on Sunday. His family owned Bletchley Park–where Enigma was cracked–before selling it to the British government in 1937.