Line of Duty : Season 4

    • Air date: 26 Mar '17 6 episodes
      The fourth series sees AC-12 facing their most devious opponent yet! Under pressure from her superiors, DCI Roz Huntley charges a young man with a series of murders after months of fruitless investigation, but is he guilty? The Chief Forensic Investigator has doubts and turns to AC-12.
  • List of Episodes (6)

    1. In the Shadow of the Truth

    • DCI Roz Huntley is under intense pressure from her superiors to apprehend a serial murderer after months of fruitless investigation.

    2. Who Sows the Wind

    • AC-12 crank up their investigation into Operation Trapdoor. Kate makes progress in her undercover role.

    3. In the Trap

    • As AC-12 wrestle with the new forensic evidence casting doubt over Tim Ifield, Kate is approached by another woman claiming to have been assaulted by Michael Farmer.

    4. Moral Superiority

    • Roz's husband Nick is brought in for questioning by AC-12. But while Nick denies any involvement in Steve's attack, his suspicions about Roz mount.

    5. Lying Nest

    • DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.

    6. Royal Hunting Ground

    • While Nick Huntley faces lengthy questioning, AC-12 remain convinced of Roz's involvement.