In the fall of 2007, a 20-year-old student named Amanda Knox was studying abroad in Perugia, Italy, and living with three roommates. One was the British student Meredith Kercher. Only two months after she arrived, the unthinkable happened: Kercher was raped and murdered in the cottage where they all lived. Along with Raffaele Sollecito, a man who she’d been seeing romantically for only a week, Knox was accused of Kercher’s murder without any forensic evidence. The subsequent investigation...