A demented serial killer taunts a retired police detective with a series of lurid letters and emails, forcing the ex-cop to undertake a private, and potentially felonious, crusade to bring the killer to justice before he can strike again. | Mystery, Sci-Fi & Fantasy, Drama | 3 Seasons | 30 Episodes | Series Premiere: Aug 9, 2017 | Last/Latest Episode: S03 E10 on Nov 12, 2019