It is February 1942 and the war in the Atlantic looks grim for the Allied convoys. The 'Great Blackout' has started, leaving the spy centre of Bletchley Park in Buckinghamshire at a loss as to what the Nazis are planning. U-boat Command has changed the Hydra cipher. The Enigma cannot be broken. Cipher experts can no longer eavesdrop on Nazi command, which leaves convoys open for attack by packs of marauding Nazi submarines. Winning the Battle of the Atlantic will surely give Hitler a final victory. And who can stop him?
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Admiralty Anyway Asdic ASIU asked Atlantic Bakelite black bangers bloody boat bombs bridge cabin called Captain Watts chaps cipher City of Norwich Clare cold conning tower control room convoy couple Croupier depth-charges destroyer diesels dive Dönitz dozen drum Dudley Pope duffel electric motors enciphered Enigma machine feet fire forward four German going grenade hand hatch Hazell hull Hydra hydrophone hydroplanes Jemmy Jemmy’s Joan keep Kernével knots ladder Leigh light letter Lieutenant lifeboat listening looked lookouts Luftwaffe Marine merchant ship Navy Ned’s nodded obviously officer oilskin Painter passed periscope Q-ships Ramage realized rotors round seamen seemed Sergeant Keeler ship’s Shoar side signal sink sitting starboard Sten stopped submarine suddenly sure surface Teds tell there’s thought took torpedo Triton Triton manual turned twitch U-boat watch waves Wellmann what’s