Julian, an American fugitive from justice, runs a boxing club in Bangkok as a front for his drug business. His mother, the head of a vast criminal organization, arrives from the U.S. to collect the body of her favorite son, Billy, who has just been killed. Crazy with rage and thirsty for vengeance she demands the heads of the murderers from Julian. But first, Julian must confront Chang, a mysterious retired policeman who has resolved to scourge the corrupt underworld of brothels and fight clubs.