To all appearances, Dan Chase is a harmless retiree in Vermont with two big mutts and a grown daughter he keeps in touch with by phone. But most sixty-year-old widowers don't have multiple drivers' licenses, savings stockpiled in banks across the country, and a bugout kit with two Beretta Nanos stashed in the spare bedroom closet. Most have not spent decades on the run. Thirty-five years ago, as a young hotshot in army intelligence, Chase was sent...