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Milquetoast botanist Harold Bledsoe (Harold Lloyd) reluctantly travels to San Francisco to take over his late father's position as a high-ranking police detective. Despite the meddling of a crotchety sergeant (Edgar Kennedy) and the bluster of an outraged community leader (Charles Middleton), Harold begins an investigation of a Chinatown opium smuggling ring led by a mysterious figure known as the Dragon, while also wooing the tomboyish pixie Billie Lee (Barbara Kent).
Milquetoast botanist Harold Bledsoe (Harold Lloyd) reluctantly travels to San Francisco to take over his late father's position as a high-ranking police detective. Despite the meddling of a crotchety sergeant (Edgar Kennedy) and the bluster of an outraged community leader (Charles Middleton), Harold begins an investigation of a Chinatown opium smuggling ring led by a mysterious figure known as the Dragon, while also wooing the tomboyish pixie Billie Lee (Barbara Kent).