Sierra Six - Gray Man, Bk 11 Author:Mark Greaney Before he was the Gray Man, Court Gentry was Sierra Six, the junior member of a CIA action team. — In their first mission they took out a terrorist leader, at a terrible price. Years have passed. The Gray Man is on a simple mission when he sees a ghost: the long-dead terrorist, but he's remarkably energetic for a dead man. — A decade of time h... more »asn't changed the Gray Man. He isn't one to leave a job unfinished or a blood debt unpaid.« less