Banks and the team begin the painful job of finding out exactlywho was responsible for the incident that has affected alltheir lives. Following dogged police work, they locate andclose in on a suspect, only to be thwarted when it's proventhere's no way they are to blame. While Chief SuperintendentAnderson puts pressure on Helen to reign in Banks and close thecase, Banks becomes increasingly certain that this is all downto one man – crime boss Steve Richards. Banks' obsession withnailing Richards sends him over the edge, resulting inAnderson exiling him from the station and making Helen actingDCI in his stead.
