When 8-year-old Davi is abducted on Market Street in San Francisco, her mother Karen is gripped by fear. She finds Davi, unharmed, but a note is pinned to Davi's shirt ("You're next, Karen). Haunted by the note, Karen relentlessly seeks to find out who abducted Davi. Her clues: Davi's recall of a brown sofa and the words "Red Diana."