A member of a top-secret team of British cryptographers, Tom Jericho succeeds in cracking "Shark," the impenetrable operational cipher used by Nazi U-boats, but when the Germans change the code, Jericho must break the new code before the traitor among his group can stop him. Reprint.
Review: Aardig verhaal in dit genre. Niet zo goed als zijn andere boek, ‘Vaderland‘. Het is jammer dat er weinig echte aandacht was voor de Enigma code zelf
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