San Francisco, 1878. Ah Sahm, a newly arrived Chinese immigrant with serious fighting skills, is introduced to Chinatown's most ruthless tong, the Hop Wei, by Chao, a fixer. After impressing Young Jun, son of tong leader Father Jun, Ah Sahm is branded and taken to a brothel, where he befriends Ah Toy, a courtesan with connections.
Set at the times of the Tong Wars in the late 1800s in San Francisco, California, Ah Sahm is a martial arts prodigy originating from China who immigrates to San Francisco and ends up becoming a hatchet man for the most powerful tong in Chinatown.