Big Zapper

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Tse Mei-chen is deeply concerned about her only family, sister Bo-chen who is obsessed with perfecting her detective sensibilities. One day, Bo-chen returns home in panic to relay to her sister and her boyfriend detective Ma Tin-lung the horrifying murder of Siu-ying by her husband Tsui Kai. But a subsequent visit to the couple's, the cousin of Bo-chen's best friend Wong Kam-fung, proves the alleged crime false. Incognizant to all, the victim was Siu-ying's twin sister Kwok-ying, who bore witness to Tsui's misappropriation of their wealth for drug trafficking. Refusing to abandon the probe, Bo-chen is held up by Tsui. Deeply perturbed by Ma's investigation into his secret dealings, Tsui coerces Mei-chen to distract her boyfriend long enough for his escape. Refusing to bow to the threat, Mei-chen informs Ma who leads his squad to the rescue of the sister and arrests Tsui and his accomplices.

Female police officer Pak Yik-wah poses as a cleaner and works in a fitness centre to gather evidence of the trainer Henry Fung's criminal activities. In the company of sister Yik-mui, the detective attends the centre's anniversary ball where she meets and falls in love with Man Hing-cheong, a well mannered guest with an elegance about him. But Yik-wah is forced to quit when her conservative father Yau-yu finds out about her moonlighting activities. To help the crime leader Wu Hung evade the police, Henry hatches a plan to murder Yau-yu who, like the wanted man, has a mole on his sole. When the sisters come under attack from a mob of gangsters following Yau-yu's disappearance, Man arrives to save the day and reveals his undercover identity. The operative hot on the heels of Wu joins hands with the sisters and lays siege to the gangster's hideout in a heroic effort to rescue the hostage and wipe out the gang.

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.

The three heroines, Wong Ang, Wu Nga, and Heung At expose a murder case involving three dead bodies found in an old temple. Unbeknown to the trio, they've fallen in a trap laid by gangster Hui Pui-shing, who desires to avenge his brother's death by eliminating the women. With the cooperation of Hui's righteous subordinate, the police arrest Hui for smuggling tobacco and seizes their forged banknotes.