Starting in the 1950s, Americans eagerly built the planet's largest public work: the 42,795-mile National System of Interstate and Defense Highways. Before the concrete was dry on the new roads, however, a specter began haunting them--the highway killer. He went by many names: the "Hitcher," the "Freeway Killer," the "Killer on the Road," the "I-5 Strangler," and the "Beltway Sniper." Some of these criminals were imagined, but many were real. The...