Reckless police inspector Sai Gau (Zhang Jin) is on a mission to crack down on criminal Shing's (Shawn Yue) gold smuggling scheme, yet fails to arrest him. As Sai Gau continues his manhunt, he discovers Shing's involvement with triad boss Blackie (Yasuaki Kurata), who hides on a casino cruise ship on the high seas. Shing has been involved in a power struggle within the smuggling ring, and is forced to kill his adopted father. He also loses his share of gold smuggling to Blackie. To get even, Shing appears on the cruise, while Sai Gau is there to hunt for him.

Former cop-turned-bar owner Kwok and his underachieving half-brother befriends a drunken woman, they soon find themselves targeted by both her former lover, a high-powered attorney, and the gangster he employs. A suitcase full of tainted cash enters the picture as Kwok finds himself torn between the gangsters and his former colleagues.

A retired British Chinese soldier, a young South Asian man, an encounter at Chungking Mansions. Coincidentally, they both offended the same gang boss. What has given them a new lease of life and how do they rediscover themselves through each other's company.

Hong Kong Customs and Excise Department officers Chow Ching-lai and Cheung Wan-nam share a close mentor-student relationship. On a case involving seized smuggled arms, Ching-lai is sent to take part in a joint operation with Interpol to capture a reclusive arms dealer. However, Wan-nam makes a drastic decision that further complicates the case.

“Once clothed as an official, you represent law and justice.” This was taught to young detective Xian who worked under Detective “Silent Dog” Ao to catch mountain robbers. To everyone’s dismay, the robbers turned out to be detectives from neighbouring counties who were forced to rob the ruling county to save the poor. Through trickery and lies, Ao started a bloodbath to kill the robbers. Shaken to the core by Ao’s deceit, the originally naïve Xian abandoned his dreams to uphold righteous values. Not to be outdone, he ended up murdering the treacherous Ao for his own gains. With blades and blood, Xian was later hailed as a legendary detective.

Ho Sau, an undercover agent, has been working with Yau, a drug lord, for years, but his job and family are in trouble.

A chief inspector in the anti-narcotics unit holds true to his beliefs as a police officer. He puts everything on the line to crack down on drugs and to bring drug traffickers to justice. How will our hero resolve this "bursting point" crisis?