A killer is on the loose, and an FBI agent sifts through clues and learns that the bloodthirsty felon's victims of choice are other serial killers.

A pair of longtime friends and former Texas Rangers crave one last adventure before hanging-up their spurs. After stealing over a thousand head of cattle from rustlers south of the border, they recruit an unlikely crew of hands to drive the herd 3,000 miles north to the grasslands of Montana.