BBC One has shared an explosive new trailer for Line of Duty ahead of its return on 21 March.The short clip has given fans a brief look at what to expect from Ted Hastings' anti-corruption unit as the team are given task of looking into whether a murder case is being deliberately impeded.
Investigating the murder of senior police officer Gail Vella, who is played by Andi Osho, AC-12 have to discover whether there are "bent coppers" that contributed to Gail's death remaining unsolved.
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