It's the question every Line of Duty fan is asking... WHO. IS. H? We hope you have mugshots of all the suspects on your wall!

Who is H in Line of Duty? Please tell us!

is here and fans couldn’t be more excited as more clues are dropped.

After the pandemic threw production for the new series into chaos, we have been waiting an agonising two years to get answers to all those questions conjured up – with the most important still being, who is H?

We have put all the clues, theories and suspects together in one place – but who do you think is the fourth and final rogue officer? Or are there more?!

Dot (centre) revealed huge clues about the identity of H as his dying declaration (Picture: BBC/World Productions/Ed Miller)

What do we know about H so far? 

H is – or we think is – not one but four corrupt officers. H is a code name referring to a group of senior ranking corrupt police officers within the Central Police.

The revelation that H was not just one individual but actually a group of officers was revealed by (Craig Parkinson) as his dying declaration in .

In the Series 3 finale Dot was fatally injured after being shot three times, however, before he passed away he provided essential information about the group of corrupt officers by blinking when () got to the letter H.

However, it wasn’t until Series 5 that () noticed that in addition to Dot’s blinking he was also making tapping motions with his hands.

In footage recorded on a police bodycam, Dot could be seen using Morse Code to indicate the letter H wasn’t necessarily the surname of a person, but a wider group.

In Morse Code, H is four dots, leading the AC-12 gang to conclude that there are four senior ranking members in cahoots with organised crime.

Adrian Dunbar as Hastings and Polly Walker as Gill in Line of Duty (Picture: BBC)

Who has been identified as part of the H line up? 

So far the names that have been identified are Cottan himself, Derek Hilton and Senior Legal Counsel Gill Biggeloe, leaving one name that we are still yet to discover.

Who could be the final H?

Is Superintendent Ted Hastings H? H rating 8/10

Ted might have some secrets, but surely he’s not corrupt? (Picture: BBC)

For a time in series 5, it was believed that our beloved () could in fact be H.

Not only had he started acting suspiciously, but he had also started to take on some of the traits of H (like the now-famous misspelling of ‘definitely’), leading to him being questioned about the crimes.

Thankfully Ted was eventually relieved of all charges when it was revealed he’d been set up, with his ‘best team’ coming to his rescue as they got their hands on some new evidence.

But have all the loose ends been tied up with Hastings? How much do we really know about what Ted gets up to when he’s not fighting rogue coppers with AC-12?

In season six, Ted has been keeping his head down around AC-12; his reputation has been damaged pretty harshly by his false accusations. Does this remove any suspicions about him? Or is this the perfect opportunity for Ted to go rogue?

Is DI Kate Fleming H? H rating 6/10

Surely Kate couldn’t secretly be H… could she? (Picture: BBC)

In a shock twist, fans have been speculating that the one and only Kate Fleming – one of AC-12’s finest – could in fact be H. They are basing their new theory on several things.

The first is that she looked suspiciously guilty in the trailer that was released by the BBC ahead of the new series starting.

Secondly, Kate has been acting weirdly this series! She also appears to be trying to send Steve off on a wild goose chase at times. Is she torn between her new job and her old one? Or is there something more sinister going on?

The third reason fans think Kate could be secretly corrupt is based on the fact she is so squeaky clean.

While both Steve Arnott and Ted Hastings have both had some slightly dodgy dealings in the past – Steve with his Lindsay Denton drama in series 2 and 3, and Ted with his financial dodgy dealings – but no one has anything on Kate. Yet.

Over the last few series she has been seen getting home late after work, but where has she been? Working hard to bring down dodgy police officers? Or leaking info to the OCG?

So far, we’ve learned that Kate left AC-12 due to her personal differences with Ted’s leadership on Operation Pear Tree in season 5. Maybe that wasn’t the only reason she left. Perhaps she moved departments within the police force to gather better intel for the OCG?

It does seem suspicious that she would turn her back on anti-corruption so easily…

Is DCI Joanne Davidson H? H Rating 2/10

Could newcomer Joanne Davidson be the last H? (Picture: BBC)

The new face in series six is , who is the latest cop to find herself under the scrutiny of AC-12.

Never since it was announced that Trainspotting and Harry Potter actress would be joining the Line of Duty cast it has been suggested by fans that she could be corrupt… could she H hiding in plain sight?

Joanne was brought in to oversee Operation Lighthouse, an unsolved investigation into the murder of Gail Vella, but while some of her actions certainly arouse suspicion, could she really have an ulterior motive?

We know she’s communicating with the OCG via her laptop, but is she being blackmailed by them? The fact that she is being told what to do suggests that she’s not in charge, and therefore perhaps isn’t H.

Is DCC Andrea Wise H? H Rating 8/10

There are three clues pointing to Detective Chief Constable Andrea Wise, played by Elizabeth Rider, being the last H.

The first clue was her determination to remove AC-12 from the investigation into Operation Pear Tree… perhaps because they were getting too close to uncovering the truth?

The second clue is that she was the one to order a separate inquiry into Ted Hastings… was it her plan to frame him for being H?

The third clues is she’s now determined to retire Ted, is that because she’s worried he’s on to her?

Is DCS Patricia Carmichael H? H Rating 5/10

Hastings’ arch-enemy, DCS Carmichael, is back

Patricia (played by Anna Maxwell Martin) was brought in during Series 5 to investigate Ted Hastings… but her case against him totally fell apart at the last hurdle.

However some fans are convinced that her determination to put the spotlight on Ted was a way of covering her own shady dealings with organised crime. Now, the character is making a surprise comeback in season 6. It looks like she’s taking over anti-corruption as Ted exits – wouldn’t it be ironic if she was H?!

Is PCC Rohan Sindwhani H? H Rating 7/10

We first saw Police and Crime Commissioner Rohan Sindwhani, played by Ace Bhatti, in Series 5, but while it looks unlikely that he has got what it takes to be the next H, he did seem very happy to sweep the disaster that was Operation Pear Tree under the carpet.

He spent a lot of time being advised by Gill, but was she using him to her advantage and he just let her call the shots? Or were they secretly working together?

He’s also spent the entire of season 6 so far trying to get rid of Ted!

Is Detective Superintendent Ian Buckells H? H Rating 1/10 (well, he’s an idiot!)

Buckells has featured in Line of Duty for some time now. As he’s not one of Line of Duty’s main characters, he may not seem the most obvious choice, but he has gotten in the way of AC-12 on multiple occasions.

His biggest mistake is almost certainly giving Kate away as an undercover officer to DCI Roz Huntley in season 4. He wasn’t exactly happy with how AC-12 treats other officers.

His major suspicious move in season six was delaying giving the go-ahead to Jo Davidson to arrest Ross Tanner, aka Terry Boyle. Perhaps this gave OCG members just enough time to clear evidence out of Terry’s flat…

Now, in jail, it is seeming more and more likely that he’s a dodgy copper. But he does seem too daft to be H, unless it’s a brilliant cover!

Or could the final H be someone we haven’t met yet? Only time will tell.

Series 6 of Line of Duty airs every Sunday from 21st March at 9pm on BBC One.

You can also catch up on series 1-5 on . 

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