 Harry Wilkerson and his partner Bemis pull a series of truck hijackings by staging fake accidents, knowing that most truck drivers will stop and attempt to render whatever assistance they can. They rely upon their confederate "Pop" (the owner of a roadside diner) to supply information concerning which drivers are carrying particularly valuable cargo. After one hijacking, Dan Mathews and Sergeant Walters use tire impressions and testimony from a victim and a hitchhiker to steadily narrow the focus of their investigation. They trap Bemis at the chicken ranch where the stolen goods were unloaded, but must use a ruse in order to trick "Pop" into leading them to the warehouse where the goods are stored.