Dot attempts to stab Arnott in the back at every opportunity until the situation comes to a head.
This is a dramatic episode that builds up to an incredibly tense conclusion.
There is little about the plot I can say without spoiling, but it's safe to comment that several characters have memorable moments such as Arnott, Hastings, Dot and Lindsay Denton. It's all very sensationalised as always, but great storytelling from the writers and strong production values.
It includes another great AC12 interview scene which is exceptionally well written, performed and visualised as always on Line of Duty.
All actors are on great form especially Keeley Hawes and Craig Parkinson.