All the Devil's Men

Jack Collins is a war-junkie and former Navy SEAL turned bounty hunter who tracks down terrorists as part of the CIA's outsourcing to private companies. His CIA handler Leigh offers him one last chance to keep fighting, sending him to London for a job. There, he finds himself part of a three-man team tasked with hunting down a disavowed CIA Operative called McKnight before he procures a WMD from Russian gangsters and disappears. (wikipedia.org)