Teenager Beatrice Donnelly is found dazed in a field with no recollection of what happened to her. Forensic evidence fills in the grim picture — she was drugged and sexually assaulted. The trail leads Lewis and Hathaway to Oswald Cooper, who works at Beatrice’s school. But Cooper has an alibi solidly supported by three pillars of the Oxford community — a prominent developer, a controversial radio personality and a former diplomat who recently returned to town.