So why the all-out necessity to get this guy? Aside from the moral issue of letting a killer escape justice, in some ways letting him go away and die peacefully made the most sense strategically. The bottom line was, Hayes was acting somewhat irrationally and he was not an irrational man. There had to be another reason.

Knox stared at the screen, reading the military records of the men and women who had served in Vietnam. He exhausted the digital trail and had to resort to the boxes after consulting with another attendant who helped him narrow his area of search. He went through thirty of the boxes without success. He was about to call it a day when his hand gripped a sheaf of papers, the top page getting his immediate attention.

As Knox leaned forward, the rest of the room seemed to slowly disappear around him. He was reading the official history of a soldier named John Carr, an enlisted man who’d quickly risen to the rank of sergeant. The account Knox was enthralled with was Carr’s heroic actions during one five-hour period nearly forty years ago.

Outnumbered dozens to one, Carr had almost single-handedly turned back an attack by the enemy, saving his company and carrying several of his wounded comrades to safety on his back. He’d killed at least ten enemy soldiers, several in hand-to-hand fighting. Then he’d manned a machine-gun nest to hold back the North Vietnamese while mortar and rifle rounds hit all around him. He’d left that post to radio in air support to allow his men to retreat safely. Only then had he walked off the battlefield drenched in his own blood and permanently scarred by bullet and machete wounds. Knox had experienced combat in those jungles and knew the confusion and horror that such confrontations almost always held. He’d been wounded. He’d been scarred. He’d been routed in action thinking this was surely his last day on earth. And he’d been part of successful attacks in the last days of America’s participation in that war in Southeast Asia, although by that time little victories in the field meant nothing. If they ever did.

Yet Knox had never read or heard of any soldier doing what Carr had done that day. It was beyond miraculous. It was beyond human, in fact. His respect, along with his fear of the man, notched upward even more.