ChanTan(by Aaron Kwok), a private detective in Thailand, travelled to Malaysia following the clues in a photo. There he looked for a man called Chai(byChan Koon Tai), who might help reveal the truths behind the murder of his parents 30 years ago. Chai's adopted daughter Zi-wei(by Jiang Yi Yan) was an orphan of Chinese descent. Under Zi-wei'sguidance, Chanfinally found Chai. But Chai said the man in the photo, Pang, a drug dealer, died quite some time ago. Meanwhile, Chanwas informed that his home was broken into. Chanthen rushed back to Thailand. Back home, Chanfound a secret compartment under his bed. But it was ransacked. He suspected what was once stashed there might have something to do with his parents'death. He could do nothing but seek help from a Malaysian private detective. Chanfound ZhengFong-hei(by Nick Cheung), a Malaysian detective born in China. Together they decided to meet Chai again. But before they could find Chai, they had a fight and went separate ways. Chanlooked for Chai by himself. Questioned repeatedly, Chai disclosed a guy called Uncle Bomight know something about his parents'death. Chanwent to visit Uncle Boaccording to the information, but was ambushed and almost got killed. Chanhad no choice but to seek Zheng's help again. Together they arrived at Chai's onlyto see a bunch of police officers conducting investigation there. Chai had gone missing. Chanand Zheng believed Chai was dead. Chanapproached Uncle Boand got a mysterious cassettetape from him, but shortly after Uncle Bowas killed right in front of his eyes. The two of them went to Zi-weiagain for more clues. Zi-weioverheard Chai talking to a man called Da-junon the phone. They mentioned having acquired an object and it was hidden in Guangzhou, China. Chanand Zi-weithen headed straight to Guangzhou. Chanmet Pang and Da-jun, hesaid hewasn't there for revenge, but to prove his parents'innocence. Pang was convinced somehow. He said Da-juntook a reel of Super 8mm film under his bed. Chan's parents captured the evidence of Qing's crime on the film and Qingwas the mastermind behind thiswhole scheme,thatwas whythey ended up being murdered. Right then, Changot a phone call from Qingwho said he had Zheng held for ransom. Qingasked for the film in exchenge of Zheng's life. Chanwent to deal with Qingalone. At the same time, Malaysian policealreadyreceived the Super 8mm film whichcapturedthe substantial evidence of Qing's crime...