MORE than 13 million people watched the penultimate episode of the BBC's thrilling Line of Duty - but the show ended on yet another cliffhanger.

Now the BBC has revealed a taster trailer for the finale coming this Sunday but what does it tell us?

One thing is for certain: Superintendent Ted Hastings is going down fighting.

The trailer shows his character doggedly pursuing the so-called 'fourth man' (or could it be woman) who has been manipulating a network of crooked cops.

And the trailer also returns to a mispelling of the word definately which had some fans thinking Ted could be the fourth man in the last series.

There are also shots of members of AC-12 in body armour and carrying weapons.

It also looks as if AC-12 set a trap for a bunch of balaclava men trying to spring a suspect - but who could that be?

It might be Kelly Macdonald whose character is now in prison awaiting her fate. Or could be be another big fish who is only caught in the last episode?

One thing's for sure - there will be plenty of twists before this Sunday's pay off.

Watch the final episode on Sunday from 9pm