The last six weeks have all come down to this - the series finale of Line of Duty.
The seventh, extra episode of the sixth series is set to air on Sunday as fans hope that AC-12 finally uncover 'H' - or should we say 'the fourth man'.
A dramatic trailer released by the BBC has teased 'every investigation has led to this…' leaving fans hoping to get answers.
Will we finally discover the identity of 'H'? Will AC-12 survive as is? And is Jo Davidson about the become another OCG victim?
There's not too long to find out - but why not test your series six knowledge to make sure you are up to speed and ready for the final episode of the series?
We have put together 15 questions relating to the last six episodes of series six to check you have been paying attention to all the drama.
Let us know how you get on!
