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Cassie turns her attention to Brentford house and the theory that one or more of the suspects may have been abused at the gatherings there. Marion is questioned again after Sinead's allegation that David could have been an IRA target. The detectives also look further into the accusations made against Colin while he was working in the city - but something does not quite seem to add up. Was his alleged victim telling the truth - and if not, why would she lie?