An unhappily married couple invite the wife's beautiful cousin, who has survived a horrifying experience in Mainland China, to live with them. She has her own special way of overcoming hardship and becomes the master of the human barbecue.

The Untold Story is a crime comedy that takes place in Macau. It follows a police investigation into a series of gruesome murders, with themes of police brutality, absurdism and accidental cannibalism. The film explores dark and taboo subjects such as rape, suicide, and violence in prison. It also delves into the macabre with scenes of severed heads and drinking urine. The plot is filled with unexpected twists and turns, keeping the audience on the edge of their seats.

Inspector Lee (Danny Lee) and his team (including Monica Chan and Cheung Kwok-Keung) look into the mysterious disappearance of a seedy loan shark (Ken Lo), but find no real leads. Amazingly, the culprits fall into their laps. Four young men, led by Wong Wing-Man (Sam Lee) confess to the killing. Apparently, they were deep in debt, and found the murder of their friend to be the only way out. There is one problem, though: no physical evidence.