Detective Chinatown 1900 (Chinese: 唐探1900) is a 2025 Chinese comedy mystery buddy film directed by Chen Sicheng and Dai Mo, starring Wang Baoqiang, Liu Haoran, with a special appearance by Chow Yun-fat. It is the fourth installment in the Detective Chinatown franchise. It is not narratively connected to the previous installments in the franchise. Wang Baoqiang and Liu Haoran, the leads in the previous films, returned but play different characters. The film, which is set in San Francisco in 1900, follows the story of Qin Fu and Ah Gui's investigation into the murder of a white woman in Chinatown. Principal photography began in July 2024 at Laoling Film Studio and ended in October of the same year. The film premiered on 29 January 2025 during the Spring Festival. The musical score for the film was composed by Nathan Wang.
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Plot
In 1900, Alice Grant, daughter of a U.S. Congressman, is found murdered and disembowelled in San Francisco's Chinatown alongside an elderly Native American chief Six Hands. The prime suspect is Bai Zhenbang, son of Bai Xuanling – leader of Chinatown's Hip Sing Tong. Exploiting the incident to advance his mayoral candidacy, Dr Grant seeks to strengthen the Chinese exclusion bill and shut down the Chinatown. To clear his son's name, Bai Xuanling enlists Qin Fu, a young detective trained by Sherlock Holmes. Qin has also come to assist Manchu official Fei Yanggu, who is dispatched by Empress Dowager Cixi to capture the revolutionaries Sun Wen and Zheng Shiliang. Initially wary of Bai's henchmen, Qin tries to escape and encounters Ah Gui, Six Hands' Chinese adoptive son, and agrees to help him track down the murderer.
Back at Hip Sing Tong, Bai receives Fei. Zheng appears, but when Fei tries to arrest him, Bai offers Zheng protection. When Qin and Gui questions Bai Zhenbang, Zheng admits he and Bai have stolen firearms from an Irish gang to prepare for Sun Wen's revolution. Qin and Fu's subsequent investigations reveal Alice was killed elsewhere and moved to the crime scene, and that Six Hands was likely murdered for witnessing the crime. They also determine that the killer was an expert with a knife and discover wood shavings in Alice's head and hair. After Grant refuses to cooperate, they instead break into the Grant household, where Qin discovers scratches on the banister.