Shanghai Knights - 2003

The film opens in the Forbidden City in 1887, where Chon Lin (Fann Wong) is drinking tea with her father, the Keeper of the Imperial Seal of China. She tells him her brother, Chon Wang (Jackie Chan), is doing well as a sheriff in Carson City, Nevada, United States, but her father replies that her brother is dead to him. At that moment, Lord Nelson Rathbone (Aidan Gillen), leads a band of Boxers into the city, who attack the Keeper. Rathbone stabs him and leaves with the seal. As he lies dying, he gives Lin a puzzle box and a letter to Chon Wang.

Back in the Wild West, Chon Wang is doing well as sheriff, having captured an impressive array of fugitives. His deputy is relaxing with a book called "Roy O'Bannon Vs. The Mummy", a highly fictionalized account of the events of the first film that now portrays Wang's "Shanghai Kid" as a cowardly sidekick.
Wang receives a parcel, which contains the puzzle box and Lin's letter, telling him their father is dead and that she has tracked the murderer to London....