Bletchley Park: the top-secret landmark of World War Two, where a group of young people were fighting to defeat Hitler, and win the war. March 1943, the Second World War hangs in the balance, and at Bletchley Park a brilliant young codebreaker is facing a double nightmare. The Germans have unaccountably changed their U-boat Enigma code, threatening a massive Allied defeat. And as suspicion grows that there may be a spy inside Bletchley, Jericho's girlfriend, the beautiful and mysterious Claire Romilly suddenly disappears.
"The brilliance of Enigma is that it gives readers the sense of being contemporary with its characters and then leads them on a dark journey of discovery to arrive at another of the Second World War's blackest horror stories, one not fully admitted until half a century later... Altogether top-class stuff. Peter Millar"