FBI Agent Ella Dark has studied serial killers from the time she could read, devastated by the murder of her own father, and has gained an encyclopedic knowledge of murderers.
When victims of a new killer are marked by a scarlet letter that spells out their ultimate sin, Ella’s obsession with the macabre becomes essential as she races against time to decode the symbolism behind each death. But will her relentless pursuit lead her too close to becoming a part of the killer’s diabolical sermon?