Ben Lewis never expected to be blackmailed by a dead man – but when confronted by Keiran Doherty, a fellow ex-Marine reportedly killed in Afghanistan, all bets are off. Doherty has stolen and hidden an encryption key that can decode Moscow’s most deadly secrets, and kidnaps Holly, Lewis’s ex-girlfriend, in a last-ditch attempt to get Lewis onside. When an assassin kills Doherty in broad daylight in London and poisons an accomplice, Lewis finds himself in a deadly race against American, Russian and Chinese agents who will stop at nothing to find the key. Can Lewis decipher Doherty’s cryptic clues, evade his would-be captors and save Holly? Or will Markov’s encrypted secrets prove even more deadly than Lewis could ever have imagined?