Line of Duty , Season 4 : In the Shadow of the Truth

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In the Shadow of the Truth: After months of hunting a serial killer, DCI Roz Huntley faces intense pressure to apprehend a suspect. Michael Farmer is caught and charged with the crimes, but doubts about the young man's guilt lead the chief forensic investigator to AC-12.

Starring: Martin Compston, Vicky McClure, Adrian Dunbar.