During the Tong Wars in the late 1800s, Ah Sahm, a martial arts prodigy from China, immigrates to San Francisco and becomes a hatchet man for the most powerful tong in Chinatown.

In the late 1800s, a martial arts prodigy travels from China to San Francisco in hopes of reuniting his family. However, once he arrives in America, he soon finds himself working as an assassin for the most respected gang in Chinatown amidst a violent turf war.

San Francisco, 1880s. Large numbers of Chinese migrants are arriving in the US, largely to fill the labour needs of the burgeoning western states. This is resulting in hostility between white, largely Irish, workers and the Chinese migrants. One such migrant is Ah Sahm, a highly skilled fighter. His skill set quickly gets him a job with the largest Chinese criminal gang in San Franciso. However, he didn't come to America for a job - he's looking for a particular woman. His searching for her leads him down a dangerous path.—grantss