After the shooting at the drugs house, DC Kate Fleming uses her undercover role to increase the pressure on Danny Waldron's armed response unit. Meanwhile, a previous AC12 investigation comes under legal scrutiny.
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Timings (where shown) are from the start of the programme in hours and minutes
One Step Closer To The Grave
Line of Duty Finale
Do you know your OCGs from your UCOs?
Find out more about Lisa McQueen and John Corbett as they burst into the new series.