The Diamond Gang commits a robbery. The leader Chiu Yee-kong wants to keep the booty and this arouses the suspicion of gang member Tai-wai. The police does not have a clue and thus invite Wong Ngung, Heung Ad and Wu Ngar for help. Kong is in accomplice with his third concubine. They order someone to steal the diamond and leave Wong's symbol. Wai turns his attention on Wong. Wong, Ad and Wu are not afraid of Wai and they throw him out. They sneak in Kong's apartment to investigate. Kong's second concubine is mad at Kong for neglecting her. She tells Wong the truth but gets killed. Kong's people surround Wong, Ad and Wu. Each of the three faces their enemy. Ad is tortured by Wai. Wong and Wu arrive in time and save her. One of Kong's people tells Wai the truth. Wai immediately attacks Kong. Wong, Ad, Wu and the police arrive at Kong's headquarter to arrest the gangsters. Wai is arrested but Kong has escaped. The diamonds are found. The inspector makes Wong, Ad and Wu as partners.
as Wong Ngung/Wong Ang
as Heung Ad/Heung Kit
as Wu Ngar / Wu Nga
as Chiu Yee-Kong
as Sung Tai-Wai
as Chiu's third concubine
as Detective To
as Fan Tai-Hong
as Wong Hoi
as Siu Ling
as Chiu's Maid
as Lee Sai
as Cheung Sam
as So Sze/Suzy
as Gangster
as Chiu's second concubine
as Gangster
as Lai Na/Lina
as Gangster
as Gangster
