Some puzzles aren’t meant to be solved. Especially when you’re the final clue.
When a cryptic riddle is sent to every phone in the city at midnight, no one takes it seriously—until people start dying. Each victim, a clue to the next, part of a chilling puzzle spelling out a name no one recognizes.
Avery Locke, a brilliant but reclusive linguist with a traumatic past and a gift for solving patterns. She's dragged into the investigation when the riddles begin referencing secrets no one but she should know. Paired with Detective Elias Reed, a skeptic with his own ghosts and a college student named Elias with a part yet to be known, they race to uncover the identity of the killer before the final riddle drops—and Avery becomes the last answer.
But as the clues dig deeper into her own history, Avery begins to wonder:
Is she solving the riddle… or is she the riddle?