Texas Ranger, Bear Haskell has been assigned to throw the cuffs on a notoriously mysterious and slippery-as-hell regulator named Jack Hyde whose cunning and devious methods of killing those he's been paid to kill, has gotten him dubbed "the Jackal." As the bodies pile up on the west Texas desert, and more jackals rear their ugly heads in Sundown, Haskell finds himself rethinking not only who Jack Hyde might be riding for, and why he's killing, but also just who he really is ...