Hawk's Fist (1978)

During a changeover in China to constitutional government, regional warlords and chiefs use the confusion to rebel against the new government. One honorable chief refuses and leaks a secret ciphered document outlining the warlords plans to local police. A shady thug working for the evil warlord faction hires the aid of two young brother scoundrels to assist in ruining the reputation of the towns police chief, Hu, who has come in possession of the leaked document. The scoundrel's sister, Ms. Poon, is in love with Hu and the brothers unwittingly work for the thugs for the sake of helping their sister. Meanwhile, the warlords have sent assassins to kill anyone who may have seen the document and end up killing the killing the girlfriend of Hu's best friend. The best friend returns and aids Hu to find those whom the document belongs. Hu then proceeds to manufacture situations and events that will lead him directly to the traitors and find all involved.