In the summer of 2016, Rachael Denhollander was scrolling through Facebook at her home, in Louisville, Kentucky, when she happened upon the cover story of the day’s Indianapolis Star. It was an investigation into U.S.A. Gymnastics, one of the nation’s most prominent Olympic organizations, concluding that for years the federation’s top officials had mishandled allegations of sexual abuse. Denhollander, a lawyer, a devout Christian, and a mother of four, had competed as a gymnast during her high-school years, in Kalamazoo, Michigan, as she explains on “Believed,” a podcast from Michigan Radio and NPR that was released last fall. In 2000, when she was fifteen, her mother managed to arrange physical-therapy sessions for her with Larry Nassar, the celebrated physician for the women’s national team. During their visits to his clinic, Nassar would drape a sheet over Denhollander’s body and, standing so as to obstruct his movements from her mother, slip his hands beneath the teen-ager’s bra and shorts. Denhollander eventually told her mother about Nassar’s actions; both women agreed that no one would believe a club-level athlete from Kalamazoo over an Olympic doctor. Over the next sixteen years, though, Denhollander assembled her own makeshift case file, saving diary entries from her youth alongside medical records from her visits to Nassar, notes from her therapist, and research from pelvic-rehabilitation practitioners about the proper protocol for the doctor’s invasive treatments. When Denhollander finished reading the Indy Star article, she noticed that it included the number of a tip line.