A war-torn soldier. A deadly secret. A manhunt across the American frontier. Mercer has one rule: never draw his weapon again. But when a cryptic package in his possession threatens to expose a powerful man's violent past, the quiet life he's tried to build shatters overnight. Now he's being hunted across the plains by a former Union enforcer with blood on his hands and orders to kill. The truth Mercer carries could ignite another war, or bring long-overdue justice to those left in the ashes. With alliances bound by shared danger and ghosts on every trail, Mercer must confront what he left behind.

and decide how far a man should go to keep a promise.