The Witchfinder — Loren D. Estleman

Jay Bell Furlong had everything. Now he's dying, and wants one thing back: the moment he turned against the woman he loved--based on a faked photograph and a heartbreaking lie. Furlong has hired Walker to find out who destroyed his love affair and shattered his life. For Walker, the answers are buried in Detroit's best and worst neighborhoods, in a history of hate, and within a murderer's bloody spell...