“Alice. July 5, 1976. The first time Alice saw them, they were walking side by side on the narrow gravel road that led into the RV park and campground. A boy and girl, moving together in a slow, slouching way with his arm around her shoulders, and her hand tucked into the back pocket of his bell-bottoms. His army-style backpack looked heavy, the seams stretching, a rolled-up orange sleeping bag tied to the bottom.”