A private investigator “Charlie Chan” (Anthony Wong) is hired to investigate Hui’s character “Siu-hung.” Superficially, she appears to be scheming to kill Khan’s father (Woo Fung), who is enjoying his new relationship with her seemingly oblivious to the threat. With time on her hands due to a suspension, Khan’s police officer “Yang Ching” is able to spy on the couple, setting in motion a relationship comedy involving her police supervisor and the private investigator – both of whom are her admirers. Although her character stops short of an embrace, it’s one of Khan’s more sensual roles. She also gets drunk, vomits and fights in short order. In the background, a band of assassins called “The Five Fingers” has been reduced to four by Khan’s actions, and comes seeking revenge.