From the Booker Prize-longlisted author of Love and Other Thought Experiments comes a masterful and gripping thriller about truth, silence, and the weight of the past. Isobel lives an isolated life in North London, where she works at a nearby library. She feels safe, so long as she keeps to her routines and doesn't let her thoughts stray too far into the past. But a newspaper photograph of a missing local schoolgirl and a letter...