Borderline on AllMovie

This crime melodrama with humorous undertones involves the investigation of dope smugglers on the Mexican border. Americans Fred MacMurray and Claire Trevor enter the scene and find themselves embroiled in the illicit activities. Both are government agents, but each one thinks the other is a crook. The real bad guy is Raymond Burr, head of the smuggling ring. At one point, MacMurray and Trevor must pretend to be husband and wife, which weakens their mutual mistrust. Eventually, MacMurray and Trevor sort out the heroes from the villains, and the dope ring is scuttled...at least for the time being.