Books like Just Another Judgement Day

God's own enforcer, the righteous engine of destruction known as the Walking Man, has come to the Nightside. His sole purpose is the elimination of the wicked and the guilty, which means no one will be left in the Nightside once he gets started. So the Authorities have hired P.I. John Taylor to stop him. Legend has it that he can't be killed. Taylor is very much hoping that the legend isn't true.