Bob Lee Swagger has seen - and delivered - dozens of deaths. As a United States Marine sniper in Vietnam, his astonishing accuracy with a rifle earned him the nickname "Bob the Nailer"; twenty years later he was forced to kill again to unravel a brutal conspiracy. Now happily secluded with his wife and young daughter in the Arizona desert, Swagger believes all the killing is behind him. Until a young writer, Russ Pewtie, arrives at his door with troubling questions about the past. Forty years earlier, Swagger's father, a dedicated state trooper, was gunned down by two robbers in a sensational shoot-out just outside of Blue Eye, Arkansas. Faced with Russ's persistence and a desire to make peace with a father he never really knew, Swagger decides to discover what really happened that long-ago Arkansas night. But as soon becomes clear, powerful people don't want the truth uncovered - and Swagger must use all his combat skills and ruthless cunning to survive. Like the infrared "black light" that exposes a sniper's target in the dead of night, Swagger homes in on the shadowy figures desperate to keep the secret of his father's murder buried.