During all the time the hardworking Barlow boys tended their south Texas spread, there'd been no rustling trouble. So when Morgan gets word of an old pal's funeral, he saddles up, leaving his brother Sam to mind the herd for a spell while he pays his respects. But during his absence Zach Medford and his gang cross the Mexican border, killing Sam and stealing the cattle.  Morgan, with revenge burning in his guts, tracks the rustlers day and night back to Mexico. During the trek, Morgan teams up with a sharp-shooting young woman named Anna Lee and Marcel Palu, a rawhide tough Cajun trapper.  Both have their own bitter debts to settle with Medford.  A week later, the trio corners the outlaws in their hideout.  This causes a no-quarter-given battle with the odds stacked heavily against the revenge seekers.