It is well known how important breaking the German Enigma code was to the Allied war effort, and the vital role played by those at Bletchley Park in cracking the cipher. But what if Nazi Germany sent spies to England to ensure the protection of their code - at all costs? Stan Ingram, who worked as an electrician on the Bombe machines at Bletchley Park, has created a thrilling tale of espionage and heroism at the heart of the deciphering operation. When Leutnant Martin Pickert is sent to England at the Fuhrer's command, under cover as a British engineer, his task is to thwart the efforts of the English codebreakers. But he has not allowed for obstacles in the shape of RAF electrician John Fletcher and US officer Pam Schwartz, who find themselves targets for the ruthless Nazi spy network and must employ all their ingenuity and bravery to halt the progress of the enemy.