One night, two sisters, 15-year-old Cass and 17-year-old Emma, disappeared without a trace. The investigation was only able to find their empty car nearby on the beach... For three years no one knew what happened. But one fine morning, Cass returned home... without her sister. She didn't have any belongings with her. She said that they were kidnapped that night and held on a mysterious island. Forensic psychologist Abby Winter sees obvious inconsistencies in her version of events. Abby is tormented by questions: what is hidden behind the façade of such a prosperous family? Why are the stepfather and his son acting so strangely? What secret is Cass keeping and what is she not telling? Will Abby Winter's discoveries shock everyone trying to find Emma?