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Notorious Untold Story director Herman Yau returns to terrify viewers with this supernaturally-charged tale concerning a Hong Kong policeman whose extramarital affair literally comes back to haunt him. Cheung Lok-man (Mark Cheng) is a hard-boiled CID detective who is better known as "Rockman" by his fellow law enforcers, and who previously entered into a heated tryst with sultry stripper Elli (Teng Tzu-hsuen) while in Thailand investigating a case involving both the Hong Kong and Thai underground syndicates. Unexpectedly summoned back to Hong Kong, Rockman promises Elli that he will return for her sometime in the not too distant future but ultimately fails to make good on his word. Three years later, Rockman is investigating a murder in Hong Kong when his son dies under mysterious circumstances and notorious fugitive Lam Chiu (Kenny Wong) murders a high-ranking policeman. Despite the fact that he was shot in the head by Rockman, Lam miraculously recovers from his would-be mortal wound and finds that he is no longer able to experience physical pain. As the local newspapers scramble to find a connection between the two cases, supernaturally perceptive detective Brother Sum (Lam Suet) begins to suspect that the lovelorn Elli may have placed a curse on detective Rockman after he failed to return to her in Thailand. At first Rockman is skeptical of this speculation, but when his grieving wife Kar-pi (Maggie Siu) begins suffering from a potent form of black magic known as Gong Tau he quickly seeks the assistance of renowned exorcist Master Clear Sea. Unfortunately the exorcism fails to take, causing the malevolent sorcerer who originally placed it to grow infinitely more powerful. Later, when Lam offers to remove the curse that hangs over Kar-pi if Rockman allows him to go free, it is revealed that the originator of the curse was Elli's guardian angel Lockman, and that the malevolent Gong Tau-practitioner is determined to make Rockman and his family suffer the worst torment imaginable.