The undercover Lee Chi-Kit, shrewd and capable, is responsible for investigating a drug gang. He becomes friends with an assassin named Eva and falls in love with the mistress of the gang leader, Judy.

Ann and her sister Betty live with May and Connie, who all work in real estate. Connie succumbs to pressure to be very nice to male clients, so to increase sales. Connie is also nice to nasty gangster Frankie, who fancies anything that moves, but particularly, Ann and Betty. There's also ex-rascal Tong, trying to keep out of trouble for the sake of his young daughter Wai. Kind-hearted Ann is good friends with them. Tong has a pal just out of jail, Chi. May is bored with her boyfriend, and leaves for Europe with another guy. Frankie tries dirty tricks to snare first Ann then Betty, and he involves Connie in a blackmail scheme. This results in innocent people getting killed, and a gory gun battle for revenge, which leaves only one of the story's characters alive at the end. The sequel, Body Lover, starts in the same scene as the finish of HK Eva.

警方接報在郊野公園山上發現一具女性裸屍，死者是外籍人士，被人強姦後虐殺，身有數百處創傷。警方成立專案小組，將疑犯抓獲，原來這個殘酷變態的兇徒背後，其實亦有一段令人心酸的故事。殺人犯康仔少時父母疏於管教，更常把康打罵發洩，結果母親離家出走，父親也置康仔不理。康輟學後，沾上不少惡習，後來康邂逅了天真聰慧的少女阿琪，琪生日當晚，二人在郊野公園喝酒慶祝，遭到兩名外籍青年侵犯，琪慘遭姦殺，康大受打擊，自此埋下仇恨的種子......