As one of the only female firefighters in her Texas firehouse, Cassie Hanwell has seen her fair share of emergencies, and she's a total pro at other people's tragedies. But when her estranged and ailing mother asks her to give up her whole life and move to Boston, Cassie suddenly has an emergency of her own. The tough, old-school Boston firehouse is as different from Cassie's old job as it could possibly be. The firemen aren't exactly thrilled to have a "lady" on the crew --- except for the infatuation-inspiring rookie, who doesn't seem to mind having Cassie around. She can't think about that, though. Because love is girly, and it’s not her thing. But Cassie can feel her resolve slipping...and it means risking it all.

One night three years ago, the Tanner sisters disappeared: 15-year-old Cass and 17-year-old Emma. Three years later, Cass returns, without her sister Emma. Her story is one of kidnapping and betrayal, of a mysterious island where the two were held. But to forensic psychiatrist Dr. Abby Winter, something doesn't add up. Looking deep within this dysfunctional family, Dr. Winter uncovers a life where boundaries were violated and a narcissistic parent held sway. And where one sister's return might just be the beginning of the crime.