Jan. 7, 1994, started out like any other typical winter morning for Rebecca “Becky” Savarese of Pittsfield, Massachusetts. There was snow on the ground, and it was bitterly cold as the 12-year-old walked to school. Then, at around 7:10 a.m., at one of the busiest intersections in town, a man came up beside her. “He had a mustache, but he didn’t shave. He seemed like a...