Jed Mercurio and World Productions’ smash hit drama returns to BBC One for its sixth instalment with Martin Compston, Vicky McClure and Adrian Dunbar reprising their roles as DS Steve Arnott, DI Kate Fleming and Superintendent Ted Hastings.
When new information comes to light about a possible suspect in a year-long unsolved murder investigation, DCI Joanne Davidson (Kelly Macdonald) appears keen to finally bring Gail Vella’s killer to justice.
However, after her conduct arouses suspicions, it’s not long before AC-12 are on the case. But as AC-12’s investigation uncovers deeper and darker information, will DCI Joanne Davidson turn out to be their most dangerous adversary yet?
Line Of Duty begins Sunday 21st March at 9pm on BBC One.