Fifteen-year-old Caitlin Whittington is the second girl to disappear from Paradise Falls in five months. As fears grow that she won't be the last, Grace Whittington makes some surprising and unsettling discoveries about her stepson, Adam. When she uncovers information that seems to implicate him, the fault lines of a happily blended family crack wide open. the case falls to Detective Rayna Godwin, who is hampered by memories of her own murdered daughter and the suspicion that there is more to the disappearances than meets the eye.