Line of Duty Wiki

Monsters is the first episode in Series 3 of Line of Duty and the twelfth overall episode. It was first broadcast on BBC Two on 24th March 2016.


Police anti-corruption unit AC-12 return for another investigation. Sergeant Danny Waldron and his armed response team shoot dead a hardened criminal, but cracks soon appear in their story. Are they hiding a cold-blooded murder?


Part I[]

Main article: Monsters Recap Part I

Part II[]

Main article: Monsters Recap Part II


Opening Credits[]

Closing Credits[]


  • Chrissie Harris as Police Officer AC-12
  • Hugh Irvine as Crime Scene Investigator (CSI) Burslem
  • Frank Cannon as Solicitor
  • Kristy Robinson as PC Karen Black
  • Roman Beguns as Police Officer AC-12


Filming locations for this episode include Invest Northern Ireland HQ and Belfast BT Riverside Tower (AC-12 Building), Tourism Northern Ireland carpark (AC-12 carpark) and Belvoir Drive (flat where drugs raid happens).