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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). Wikipedia