Back in the 1970s, Hong Kong was riddled with corrupt officials that the Government determined to bring to book. Much to the chagrin of one of the principal culprits - the police - they established an anti-corruption unit charged with addressing this problem, and thanks to one of their lead investigators (Andy Lau) they succeed! Many years later, when the British and Chinese start to talk about the colony's reunification, the Stock Market plummets and he is brought back to investigate the wealthy boss of a large network of companies (Tony Leung) who is living his gilded life of luxury whilst…