The Girl from Monterrey.

Mexican club singer Lita Valdez is amazed to find that her younger brother Alberto is a talented boxer and is even more thrilled by his consistent success in the ring. Till he is forced to fight Jerry O'Leary, the man she loves. Caught between her devotion to both men, Lita tries her best to have the match canceled, but there is much more to the boxing racket than she had ever imagined...