The incredible story of how HMS Petard and her gallant crew seized priceless German Enigma codebooks from a sinking U-boat is one of the greatest stories of the Second World War. With the use of vivid eyewitness accounts, the author describes how this operation changed the course of the entire war.
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Much more about the general exploits of HMS Petard which therefore includes a brief mention of the capture of the papers needed to break into Germany's naval Enigma codes. Vast, unacknowledged bravery (at the time, due to security) for sure.
I got a little irritated at the bulk of the book which chronicled various other wartime missions with nothing at all to do with Enigma. Interesting in its own right - though occasionally reading a little like a list of diary entries: "went here, did that; dry-docked; went there, did this; ..." - it was not what I expected from a book with this title.