In Secret Police, Alex Fong pretty much hangs around gangsters, stresses out his girlfriend with his reluctance to commit and embarrasses his father (who’s a cop) when he gets into trouble. Moon Lee plays his sister who’s also a cop that is transferred to the station her father works at. Moon and Alex don’t get along so well. In fact, Moon can’t stand her brother or his lifestyle. Tragedy strikes when their father (Ku Feng) is murdered in cold blood by a hired hitman (Billy Chow).