Line of Duty fans were left in disbelief after the finale of the BBC drama finally unmasked 'H'.
After Chloe made a breakthrough with the Lawrence Christopher files she found one police officer consistently misspelt 'definitely'.
DI Arnott, DI Fleming and Hastings brought them in for questioning after a search of their homes and cell.
DI Ian Buckells was brought into AC-12 for interview were he confessed to being the man behind the screen and ordering the killing of of serving officers and theft of police items.
Many were astounded that Buckells could have been the mastermind behind the institutionalised corruption in the police force given his bumbling antics, as Hasting said himself in the final episode: "You have failed upwards. It beggars belief.
"Your corruption has been mistaken for incompetence."
Taking to Twitter @anne_tac said: "There must be another twist because this ain't it."
@Stephen_Logan said: "Surely this can’t be it."
@GaryMMcEwan said: "Buckells is definitely a patsy for someone else here."
@lyrabinx said: "WHAT a disappoint..."
@JeanBarber said: "Not going to lie - fairly disappointed with that ending."
@stewilkinson198 said: "Biggest Anti Climax ever."
@garry_mufc68 said: "Disappointed to say the least"
At the end of the episode we see Buckells awaiting trial and AC-12's powers to investigate corruption weakened as part of Carmicheal's restructure.
*Line of Duty is available on BBC iPlayer
