Between the Lines S02E01 - New Order

Clark is called to investigate the failure of a uniformed constable to arrest a violent racist; it transpires that this is a Special Branch undercover officer, but it isn't clear whether he still has the interests of the law as a priority. Meanwhile, Deakin is on trial and Clark's rival, Graves, is up for promotion. The visit of an American revisionist historian, Deakin's acquittal and Graves's promotion all cause headaches for Clark.