Enigma

In this fictionalized account of the British cryptography project, British cryptoanalysts have discovered to their horror that Nazi U-boats have changed their enigma code. Authorities enlist the help of a brilliant young man named Tom Jericho to help them break the code again. The possibility of a spy within the British code-breakers' ranks looms large, however, and Tom's lover, Claire, has disappeared. With the help of Claire’s best friend, Tom discovers both personal and national betrayals.