DocumentarythatrevealsthesecretstorybehindoneofthegreatestintellectualfeatsofWorldWarII,afeatthatgavebirthtothedigitalage.In1943,a24-year-oldmathsstudentandaGPOengineercombinedtohackintoHitler'spersonalsuper-codemachine-notEnigmabutaneventoughersystem,whichhecalledhis'secretswriter'.TheirbreakturnedtheBattleofKursk,poweredtheD-daylandingsandorchestratedtheendoftheconflictinEurope.ButitwasalsotobeusedduringtheColdWar-whichmeantbothmen'sachievementswerehushedupandneverofficiallyrecognised.