 Counterfeiters Henry Warren, Jim Arnold, and Sam Barstowe use a legitimate-seeming front (the "Warren Tungsten Mine") to conceal their operation. They decide to leave the area for awhile and safeguard their counterfeit plates by packaging them in tubes of nitroglycerin and hiding them in their car trunk. Ruthless hoodlum Richard Goff steals the plates and murders Arnold and Barstowe in the process. He also shoots and paralyzes Warren and then steals the car. Dan Mathews and U. S. Secret Service agent Ed Taft trap Goff at a roadblock and take him back to the mine for Warren to identify. They subsequently discover the plates and the nitro in the car trunk and must VERY carefully move the explosives to a safe location.