Rainbow Six by: Tom Clancy
At its heart is John Clark, the ex-Navy SEAL of Without Remorse and well-known from several of Clancy's novels as "the dark side of Jack Ryan," the man who conducts the secret operational missions Ryan can have no part of. Whether hunting warlords in Japan, drug lords in Colombia, or nuclear terrorists in the United States, Clark is efficient and deadly, but even he has ghosts in his past, demons that must be exorcised. And nothing is more demonic than the peril he must face in Rainbow Six; a group of terrorists like none the world has ever encountered before, a band of men and women so extreme that their success could literally mean the end of life on this earth as we know it. It is Tom Clancy's most shocking story ever--and closer to reality than any government would care to admit.