Western where a fly got chopped in half by a samurai

A mysterious woman comes to compete in a quick-draw elimination tournament, in a town taken over by a notorious gunman.

In 1876 Wyoming, the gun is the only law. And for Duncan and Suzanna McKaskel, newly arrived settlers beset by outlaws, rugged frontiersman Con Vallian is the only hope.

A disgraced warrior planning the murder of a Japanese diplomat, and a ninja in the employ of a navy official are about to land in San Francisco when a band of thieves steal the money the diplomats are carrying. The two set off on a chase across the American west to catch the robbers.