Line of Duty , Season 4 : In the Trap

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In the Trap: AC-12 uncovers holes in the case against Michael Farmer and suspects that the real killer could still be at large. As the team struggles to sort through the evidence, Steve challenges Roz's husband, Nick, to account for his wife's whereabouts on the night Tim Ifield went missing.

Starring: Martin Compston, Vicky McClure, Adrian Dunbar.