S3 E12: Hartless Hobby
S3 E13: My Hart Belongs To Daddy
S8 E22: Murder On Madison Avenue
S4 E416: The Price Of Tomato Juice
Who polices the police? This lot do. Line Of Duty follows controversial anti-corruption unit AC-12, operating within West Midlands Police Force and led by steely Irishman DSI Ted Hastings.