Matt Calder is a rugged widower with a questionable past who decides it’s time to start a new life with his young son, Mark. But their peaceful existence is sabotaged when Matt is robbed and pistol-whipped by cold-blooded gambler Harry Weston. Unexpectedly, Weston’s fiancée, Kay, postpones her wedding so she can nurse Matt back to health. In his pursuit to exact revenge at any cost, Matt takes Kay and Mark on a treacherous ride down a roaring river, where they’re at the mercy of wild animals and a lawless frontier.