Decades after persecution and loss drove him into hiding, one old preacher has received a vision from God—in one week, his city will be destroyed. Walter Barnes abandoned his pulpit long ago and has watched as the church he loved faded into silence, giving an increasingly violent world over to its own devices. Now judgment is coming, but like Abraham, Walter has made a wager with God. If he can change the heart of the city, then mercy will have its day. His journey will lead him from the broken streets to the steel citadels of a city that has forgotten him and his faith, forcing him to confront the choices that have haunted him for years. And the clock is ticking.