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Harold Bledsoe, the son of a former chief of police in San Francisco, is called to the city to quell the flourishing crime among Asian and American gangsters. En route, Harold, a meek botanist, stops to examine some flowers and misses his train, but he gets a ride with Billy Lee and her young crippled brother, who are going to San Francisco for an operation on the boy's leg. Dr. Gow, a kindly physician, complains of the evil of narcotics to Captain Walton, as does John Thorne, a supposed reformer but actually an underworld leader. Harold promises action, and, disguised as a Chinese man, he infiltrates a flower shop to rescue the doctor from the villains. The criminals escape, but by matching a set of fingerprints, Harold proves Thorne's guilt and forces a confession from him.