Following the events of its predecessor, where Chan Tam discovers that his parents were murdered. Determined to find his parents' murderer, Tam takes a photo with him as a clue and travels to Malaysia and looks for Brother Chai. Chai reveals to Tam that his parents were drug traffickers and their death is also drug-related, telling him that he can obtain more clues from Uncle Bo and Fai. Tam was unable to accept the fact that his parents were drug traffickers. Later, Tam's house was burgled, where an object sitting in a dark shelf went missing. Tam suspects the object to be an important piece of evidence that is related to the death of his parents. Being a complete stranger in a foreign country, Tam hires a local private detective, Cheng Fung-hei, to assist him in the investigation. Subsequently, both Tam and Fung-hei encountered attacks, while Chai disappeared and Bo was killed. Chai's adopted daughter, Chi-wai, believes that a certain object have fallen into the hands of Tai-kwan, who is currently at Chai's former residence in Guangzhou. To find out the truth, Tam proceeds to Guangzhou with Chi-wai, while Fung-hei continues his investigation in Malaysia. Later, Fung-hei receives a box of silent tape, which he hands to police officer Ma. At the same time, Tam also receives a box of Super 8 film and finds a password hidden in the film. Tam and Chi-wai return to Malaysia and split ways, with the former meeting up with Fung-hei while the latter hands the password to the police. However, Tam and Fung-hei were captured under the order of Tung Ching, who was the murderer of Tam's parents. Ching also reveals the truth, where thirty years ago, he and Tam's parents set up a transportation company, which Ching uses to transport drugs. When Tam's parents discover this, they refuse to partake with Ching and intend to expose his criminal activities, and were killed by Ching. After everything became clear, Ching intends to kill Tam and Fung-hei. At this time, Ching was suddenly shot. While attempting to flee by car, Ching was crushed to death by Fai and Bo's son. The former saves Tam and Fung-hei as he was helped by Tam's parents in the past, while the latter wanted to avenge his father. On the other hand, the police was able to retrieve evidence of Ching's criminal activities from the password and silent tape and successfully disintegrates his crime organisation and drug manufacturer.
