Line of Duty's finale mysteries solved in full - H's identity, Ted's money stash and more Mirror 4 hrs ago Vicki Newman After years of armchair detective work, Line of Duty fans finally know the identity of H. The "fourth man" who was working with the Organised Crime Group (OCG) from a high-up position in the police force was unmasked in last night's explosive season six finale of the BBC cop drama. Following plenty of red herrings and accusations against our favourite characters - including the legendary Ted Hastings himself - we finally know the corrupt copper who's been pulling the strings from behind the scenes.