The Alloy of Law by Brandon Sanderson
Three centuries have passed since a young woman named Vin and a band of assorted thieves used the powers of the Mistborn to save the world of Scadrial, dispersing the ash-clouds forever. Vin and her cohorts have become figures of myth or religious awe, but time has moved on. Great skyscrapers are racing for the sky whilst steam and electrical power are becoming more commonplace. Out in the Roughs, Waxillium Ladrian has spent twenty years trying to bring peace and order to a rough, frontier land. Called home to the city of Elendel by the death of his uncle and forced to inherit his family's estate and business, Waxillium finds trading his six-shooters for cost ledgers to be harder than he'd expected. A spate of kidnappings and disappearance soon tempt him back to a life of law-enforcement, but Wax needs to face his own guilt before he can face down an old enemy. The Alloy of Law is a (mostly) stand-alone novel set in the same world as Brandon Sanderson's earlier Mistborn Tr...