Eleven million viewers tuned in for the penultimate episode last Sunday, in a series high total.
If you are thinking of tuning in for the season six finale, here is all you need to know.
What channel is Line of Duty on?
The final episode of season six of the hit drama will be on BBC One.
What time does the episode start?
It will air at 9pm on BBC One.
Is it on streaming?
You will be able to watch the episode on BBC iPlayer as it is aired, and then afterwards as well.
However remember you do require a TV licence to watch BBC iPlayer.
Will the search for H come to an end?
It is anticipated that the multi-season search for the mysterious high ranking corrupt police officer H will come to a dramatic end in tonight’s episode.
Who do viewers think is H?
Earlier this week, a YouGov poll found viewers of the programme think Chief Constable Philip Osborne is the most likely candidate for H.
A total of 22 per cent of viewers believed him to be the mystery officer anti-corruption unit AC-12 are hunting for in the series.
Detective Chief Superintendent Patricia Carmichael was the second most popular choice after being selected by 19 per cent of viewers.
Has a seventh season been confirmed?
A seventh series of the hit drama has not yet been announced.
On Friday actor Martin Compston, who plays DI Steve Arnott in the series, told The Jonathan Ross Show that Line Of Duty will not return for future series ‘just for the sake of it’.
He added the ‘natural story arc that we’ve been on for the last six years (is coming to an end)’.