Police anti-corruption unit AC-12 get a tip off about DCI Joanne Davidson, who is leading a murder inquiry into the death of journalist Gail Vella. It’s alleged that she deliberately diverted an armed convoy on the way to arrest a suspect. As AC-12 begin to investigate, they quickly realise they’re up against their most enigmatic adversary yet. Is DCI Davidson taking orders from ‘H’, the Fourth Man? Will Superintendent Ted Hastings see out his career-long fight to uncover institutionalised corruption?
7 Eps.
Cast: Martin Compston, Vicky McClure, Adrian Dunbar
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