James Quinn - A game for Assassins - The Redaction Chronicles - Book 1

It's the height of the Cold War, and an unknown team of assassins is targeting agents of the British Intelligence. In desperation, the agency sends in their best agent to hunt down the killers.
Jack "Gorilla" Grant isn't one of your typical secret agents. Uncompromising and rough-edged, he doesn't fit in with the elitist and debonair intelligence operatives.
Drawn into a deadly game where nothing is as it seems, Jack soon realizes that even the perfect spy can die in a wilderness of mirrors.