Hong Kong is plagued by a series of terrible murders, of former suspects in cold cases who’ve evaded capture for years, by a vigilante gang calling themselves the Chosen Sleuths. In order to tell a whole entire story that includes new generations of detectives and villains, the film starts off with a series of murders committed years before most of the (new) Chosen Sleuths were even teenagers, some even not born yet, just bear this in mind. It becomes relevant later, but for now lets keep this...