The Gray Man

In 2003, the CIA recruits Kurt Gentry, who is serving a murder sentence, and he becomes a so-called "gray man," a special agent codenamed Sierra Six. Eighteen years later, after eliminating a target, he learns that he has just killed a former Sierra Four, and he receives a data carrier containing information that poses a threat to the secret Sierra program. Refusing to hand over the card to his superiors, Six becomes a target not only for his former colleagues but also for elite mercenaries, with the most dangerous being the ruthless Lloyd Hansen.