Texas Rangers Woodrow Call (KARL URBAN) and Augustus McCrae (STEVE ZAHN) pursue three outlaws, Comanche war chief Buffalo Hump (WES STUDI), Comanche horse thief Kicking Wolf (JONATHANN JOSS) and a Mexican bandit king (SAL LOPEZ). Now in their middle years, they also struggle with their personal lives, Gus with Clara Forsythe (LINDA CARDELLINI), the love of his life, and Call with Maggie Tilton (ELIZABETH BANKS), the young prostitute who loves him. Meanwhile their partners-in-arms Deets, Jake Spoon and Pea Eye Parker help the Rangers protect the advancing western frontier from the defiant Comanches who are determined to defend their land and way of life. This is a prequel to "Lonesome Dove," and based upon the novel by Larry McMurtry.