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"Negative Pressure" is the fourth episode in Series 3 of Line of Duty and the fifteenth overall episode. It was first broadcast on BBC Two on 14th April 2016.

Summary[]

Fresh testimony launches AC-12 back on the trail of the Caddy, a corrupt officer with links to organised crime. But new disturbing evidence suggests the Caddy may reside within AC-12. 

Recap[]

Part I[]

Main article: Negative Pressure Recap Part I

Part II[]

Main article: Negative Pressure Recap Part II

Cast[]

Opening Credits[]

Closing Credits[]

Uncredited[]

  • Chrissie Harris as Police Officer AC-12
  • Kristy Robinson as PC Karen Black
  • Ross Moneypenny as AFO
  • Ash Cook as Young Joe Nash

Locations[]

Filming locations in this episode include Invest Northern Ireland HQ and Belfast BT Riverside Tower (AC-12 Building).

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