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"Both twisted and twisty, this smart psychological thriller sets a new standard for unreliable narrators." -BOOKLIST , Starred ReviewOne night three years ago, the Tanner sisters disappeared: fifteen-year-old Cass and seventeen-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.