 Crooks have constructed a small mobile "town." They use it as a speed trap to snare money from unsuspecting motorists and, for bigger game, as a way to hijack trucks carrying valuable merchandise. After two hijackings, Lois Lane comes upon the "town" and is captured. Now, Clark Kent, Jimmy Olsen and Inspector Bill Henderson are trying to track her down. After they, too, are incarcerated, Clark turns into Superman to shut down the criminal operation.