Ai Tong-Kua

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Lung Kim-fei and Kau Yuk-wah seal their nuptials following the reconciliation between their masters, Ku Hon-wan and Suen Bik-ling, but the auspicious day is marred by the assassination of Suen. Eager for revenge, Kau Yuk-kuen visits Ten Thousand-hand Lohan who reveals the killing weapon to be a silver thunderbolt shuttle and supplies a list of martial arts suspects. On her way to track down Lau Piu-piu, the helmswoman of Heavenly Fragrance Sect, Yuk-kuen is abducted by Auyeung Ho and the protege of the Three Invincible Palm.

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.