The mysterious Lee Fong (Edmund Breese) covets a rare jeweled dagger from China. He sends American Ralph Bonner (Frank Mayo) to Shanghai to retrieve it, but, when Ralph returns to San Francisco, the dagger is stolen from him by Ying Su (Carmel Myers). Fong ends up dead, and Ralph and the dagger are missing. Ralph's brother, Jim (Rex Lease), goes in search of Ralph and the dagger, but the cops believe he's the one behind the murder and the theft. Jim tries to clear his name.