The Big Chase(1966)

The Big Chase is a Hong Kong crime thriller following two sisters caught in a web of murder and deception. When detective Bo-chen's best friend reports a killing, she and her boyfriend Ma Tin-lung investigate what appears to be a straightforward case of spousal murder. The truth proves far darker: the victim is actually the dead woman's twin sister, who discovered her brother-in-law Tsui Kai's drug trafficking operation and paid with her life. As Bo-chen refuses to drop the case, Tsui grows desperate, kidnapping her and forcing her sister Mei-chen into an impossible choice. When Mei-chen alerts Ma instead of complying, he mobilizes his team for a daring rescue. The film builds toward a climactic confrontation as the sisters' determination to expose Tsui's crimes puts them in mortal danger.