Misfortune County (2015)

The year is 1900. An assassin known as Lady Vengeance wanders the frontier, exacting revenge on killers who've escaped justice. On the hunt for a scoundrel on the lam, she crosses paths with a dead rancher's bastard son, an idealistic Philadelphia dandy, and an outlaw who steals books, their lives all converging towards a brutal and bloody showdown in the mountains of Eastern Oregon.