When a game of poker ends in acrimony Sheriff Cassidy Yates has to step in to resolve the dispute. After jailing one man he reckons the matter will end there, but that very night one of the players is killed and another is thrown out of a hotel window.

With the players having included a railroad man and an outlaw Cassidy reckons the incidents are connected to a silver shipment that is due to pass through the town shortly. Raids have been attempted before, but this time it looks as if the men hired to protect the shipment are involved in a plot to seize it. Even with brutal raiders and corrupt railroad men to defeat Cassidy vows that this is one raid that will never happen.