Rachel Watson, devastated by her recent divorce, spends her daily commute fantasizing about the seemingly perfect couple who live in a house that her train passes every day, until one morning she sees something shocking happen there and becomes entangled in the mystery that unfolds.

Wisecracking, gum-chewing 12-year-old Gilly is well known in the foster system. Totally unmanageable, she has stayed with more families than she can remember and has outwitted them all. After all, how can she settle down when her real mother, the beautiful and glamourous Courtney, might be out there waiting for her? When Gilly is sent to live with the Trotters, the weirdest family yet, she isn’t planning to stick around. But cheerful, affectionate Maime Trotter isn’t giving up on Gilly just yet...