Silencer / Andy McNab.

1993: Under deep cover, SAS operative Nick Stone has spent weeks in the jungles of Colombia. His mission: to locate the boss of the world's most murderous drugs cartel - and terminate him. But to get close enough to fire the fatal shot, Nick must reveal his face. It's a risk he's willing to take, since only the man who is about to die will see him. Or so he thinks... 2011: Now living in Moscow, Nick has just become a father. When the doctor who has saved his newborn son's life suddenly vanishes, Nick finds himself racing across the globe in a quest to find her before it's too late. The trail leads from Moldova, to Hong Kong, to Mexico, propelling him back into the brutal world he thought he'd left behind...