Line of Duty fans were frantically trying to figure out who the mysterious ‘H’ was before he was finally revealed on Sunday night.
The gripping finale of the sixth series of the BBC cop drama drew in huge crowds as 12.8 million tuned in to discover who the mastermind criminal was.
And in underwhelming fashion, ‘The Fourth Man’ was unveiled as DCI Ian Buckells, much to the surprise of most viewers.
However, the show’s creator Jed Mercurio has admitted that there were actually clues throughout the hit drama leading as far back as the very first series.
Most fans pointed the suspicious finger at the likes of the main characters Kate, Steve and Ted.
Be the first to read the biggest TV stories as they come straight to your inbox.
The Mirror’s TV newsletter brings you the latest headlines on the best shows, articles on your favourite characters and all the inside track from our team.
Never miss a moment by signing up to our newsletter here.