Marvin Davis is hired as 'muscle' in a blackmail payoff. The following day his client and the client's brother are murdered. Before Marv can do anything about the murders his girlfriend, Shelia Goodwin, is kidnapped by a Mexican cartel boss and Marv is launched into full bore vigilante mode.Tearing through a long, hot Dallas night Marv takes the law into his own hands to free Shelia and to solve all of the Dallas Police's headaches.