Money. Death. Colossal profits. Game with danger! The world of underground lotteries, gambling houses and secret fights without rules. Aurelio Santos - a famous martial artist - was found murdered. His student and friend is private detective Frank Baer, who solved many complex and complicated cases, - begins his own investigation. He is sure: Aurelio was an honest man who never broke the law. But perhaps this was precisely the reason for his death? After all, he more than once crossed the path of people living according to the laws of the criminal world. And those who challenge them often pay for their insolence with their lives...