Three lives come together in unexpected and deeply thrilling ways - on a hot summer day, Joanna Mason's family slowly wanders home along a country lane. A moment later, Joanna's life is changed forever...On a dark night thirty years later, ex-detective Jackson Brodie finds himself on a train that is both crowded and late. Lost in his thoughts, he suddenly hears a shocking sound...At the end of a long day, 16-year-old Reggie is looking forward to watching a little TV. Then a terrifying noise shatters her peaceful evening. Luckily, Reggie makes it a point to be prepared for an emergency.