In 1970s Hong Kong, the Independent Commission Against Corruption (ICAC) was formed to bring down the corruption syndicate led by British government officials. One of its top investigators is Senior…

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

Two police pursuit drivers, a hothead rookie and his long-suffering, almost-retired mentor, face off against an escape car driver from the latter’s past.