After winning the Civil War against the Confederate Wielders, the Union Machinists have outlawed magic to usher in a new age of steam-powered technology. Diah, an alchemist and the only non-wielder in his family, owes his brother for saving his life in the war; so when Cager is blackmailed into procuring the magical hide of the White Buffalo, Diah accompanies him to the Dakota territory.

Their guide is Oni, a half-Lakota woman with plenty of secrets to hide. She’s a magic wielder with an illegal wand concealed in her knife—and she’s a coyote shifter. To her people, killing the White Buffalo is not only sacrilege, it’s dangerous. Oni has no intention of helping them actually achieve their mission—until she falls in love with Diah…