Synopsis by Hal Erickson
South-of-the-border singing sensation Tito Guizar stars in Cuando Canta la Ley. Guizar is cast as Mexican secret-service agent Alberto Gallindo, dedicated to tracking down the murderer of a fellow agent. With the aid of his erstwhile sidekick Adobe (Martin Garralaga), Alberto follows the trail of evidence to the hacienda owned by pretty Maria Luisa Pineda (Tana). In the tradition of Hollywood's Gene Autry, our hero gets to sing a lot and romance his lady fair before hunkering down to the detection business at hand. Cuando Canta La Ley was distributed in Mexico and in North American Spanish-speaking communities by Paramount Pictures, for whom Tito Guizar had appeared in The Big Broadcast of 1938.