A girl held captive her entire life... After a shocking discovery, the police must unravel a mystery that horrifies the nation. A detective condemned as a criminal... Violently abducted while searching for a missing woman, D.S. Abigail Boone suffered retrograde amnesia - remembering nothing of her previous life. Defying the law to hunt those responsible, she now languishes behind bars. A monster hiding in the shadows... In desperation, police turn to Boone - who fears a connection to the disappearance of a child three decades earlier and a mysterious underworld figure whose name is spoken only in whispers. Freed from prison, what will Boone sacrifice - and who must she become - to uncover the terrifying truth?