The Devil from the River: Book One of Unforgiven Sins

After the Fires of the Burning ended the world, everyone did what they had to survive and David was no different. He carved a life for himself in the desolate frontier of the Confederacy as sheriff of a smuggling town, bending rules to make a buck and keeping his people safe from steam-powered soldiers and worse. It was a good life until a boy assassin with strange powers washed up on the river bank. Now, David finds himself in a dilemma. Turn the boy in for the hefty bounty and keep his head down, or train him to enact the revenge he's been craving for over a decade.