When the Laredo Bank vault is jammed, the Rangers grab Reese's eccentric, elderly inventor friend Major Cane to successfully open it like magic. A couple of bank robbers watching him do it, have a con artist partner convince Cane to open another vault in the Porforio Bank - this time without the knowledge of the bank management. Parmalee sends the Rangers to investigate the robbery where they realize that the inventor was involved with the robbery, but can't believe he's turned into a criminal. They send Reese to determine where the whereabouts of Cane during the robbery but Reese is kidnapped by the robbers to use as leverage to force Cane to help them rob the biggest cache of cash in Texas - The Cattle Buyer's Exchange. Worried about Reese's disappearance, Chad and Joe make use of a friendly mutt to sniff out Reese's location. Meanwhile, due to the beating of Reese and a threat to his life, Cane decides to cooperate. He has the robbers gather equipment to practice his plan for ...