When a call comes in about a young girl found dead at a high school prom -- her life drained away from a fatal stab wound -- Detective Josie Quinn drops everything to attend the scene. Taking in the girl's neatly braided hair, Josie feels a flicker of recognition. But no one comes forward to identify this innocent child, murdered on what should have been the happiest night of her life. The case takes a terrifying turn when a local teen goes missing just days before she turns sixteen. Clock ticking, Josie turns the town upside down in search of answers. But when her own chief comes forward with a missing piece in this devastating puzzle spanning decades, will it be enough to get inside the mind of the most unexpected and elusive killer she has ever encountered, or will another precious life be taken?