No Mataras (Thou Shalt Not Kill) was based on a novel by Joaquin Margall. Bilked by a politically well-connected loan shark, widowed mother Sara Garcia is thrown in jail when she tries to fight back. Hoping to avenge herself against all mankind, Garcia becomes the proprietress of a seedy gambling joint. She keeps the truth of her profession from her daughter, whom she has sequestered in an exclusive girl's school. But when the grown-up daughter is escorted to her mother's den of iniquity by her boyfriend, the results are disastrous. And that's only the first three reels!