U.S. Marshal Britt MacMasters returns from a mission to find his father wounded and his son, Chad, kidnapped by the outlaw Jed Blake. Hot on their trail, Britt forms a posse with a gunslinging deputy and a stoic Pawnee tracker. But both Jed and Britt tread dangerously close to the Red Desert’s Sioux territory, which poses a menace far greater than either can imagine.