'Line of Duty' 6.04 review — blood relatives, shock deaths and deleted emails

Line of Duty Season 6 — our five burning questions after episode four.

Kate Fleming in Line of Duty
(Image: © BBC/World Productions)

What to Watch Verdict

Season 6 steps up a gear as new twists and turns leave us reeling... ** WARNING - SPOILERS FOR ALL SEASON 6 EPISODES BELOW **


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    Jo being related to someone on the police database - how was that for a cliff-hanger ending?

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    THAT AC-12/OCG shootout. We're not sure it could have been any more tense - Line of Duty at its best.

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    Buckells in prison - not so cocky now, are we Superintendent?

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    Ted and Kate's secret meeting - some answers about Kate's exit from AC-12 at last.


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    Ted Hastings being given his marching orders - don't go, Ted!

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    Lee Banks' return - surely he is going to bring nothing but trouble?

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    Jo turning on Kate over Ryan's stalking - when will Kate see that Jo is in big trouble?

Line of Duty delivered fans a real treat this week, because episode four of Line of Duty Season 6 had it all — high drama, shock deaths and a cliffhanger ending that is going to keep viewers speculating until 9pm next Sunday evening, 

But as always Jed Mercurio and his team have left us with many unanswered questions to keep us awake at night. Here's our list of five HUGE questions after Season 6 episode 4... 

Now that's what we call a cliffhanger ending! The revelation that Joanne Davidson is related to someone whose DNA is kept on police records will have fans around the country trying to work out who it is Jo shares a family tree with.

Could it be Steve Corbett? Is that why Jed has brought his wife Steph Corbett back for Season 6? Or is it someone from further back in Line of Duty history? Jed is famous for bringing long-forgotten characters back to the forefront of fans minds, could Jo's long lost relative be from Seasons 1 or 2? 

And what side of the law is Jo's blood relative on? Could the fact she is being blackmailed by the OCG or a corrupt leading officer be because she is related to them? Does she share DNA with Ryan Pilkington? Former OCG leader Tommy Hunter? Or even Lee Banks? 

Kate Fleming and Jo Davidson in Line of Duty

Kate saw a different side to Jo in episode four.  (Image credit: BBC/World Productions)

Is Kate starting to realise Jo is up to something? 

Until now Kate Fleming (Vicky McClure) has always seen the best in Jo Davidson. The pair clearly get on, sharing cosy chats over a glass of Sauvignon or two, but this week was the first time that Jo gave Kate a real reason to doubt her. 

Despite Steve Arnott's (Martin Compston) desperate attempts to get Kate to see Jo is hiding something, Kate has always maintained her boss's innocence, even worrying about her safety and giving her the heads up that Ryan Pilkington has been following her. 

However, when Kate confronts Jo over Ryan's shady antics, Jo still had Ryan's words of warning ringing in her ears and set Kate straight once and for all by hinting that she would use that fact Kate was following the police patrol car that was supposedly taking Terry home and didn't call for backup until the vehicle was in the reservoir. 

Will this flash of Jo's darker side make Kate sit up and take note? After being warned by Ryan that Jimmy Lakewell's cause of death was 'being a rat', Jo will clearly go to any lengths to keep her secret safe. But will her lies leave Kate in danger?

Kelly Macdonald as Jo Davidson in Line of Duty

Jo Davidson has clearly got herself between a rock and a hard place.  (Image credit: BBC/World Productions)

What fresh drama will Lee Banks bring? 

He's back! The last time we saw Lee Banks was at the end of Season 5 when Ted Hastings (Adrian Dunbar) went to visit him in HMP Blackthorn. While we still haven't had clear confirmation on what Ted was there to say to Lee in prison, it has been heavily hinted that Ted was the one who outed John Corbett as being the undercover police officer in the OCG. 

Lee might still be serving time at Her Majesty's Pleasure, but that doesn't stop him working for the OCG from the inside. Not only does he appear to have many prison staff working undercover for organised crime, but he also taught DCU Ian Buckells what happens to a rat by killing Jimmy Lakewell in front of him. Something tells us this isn't the last we have seen of Lee. 

Will Superintendent Ted Hastings really leave?

Everyone knows Line of Duty just wouldn't be the same without Ted Hastings, but Jed Mercurio is also renowned for not being afraid to get rid of big names in the show, meaning no one is safe - not even Ted. 

Could Ted really be retiring at the end of Season 6? Or will AC-12 manage to pull something out of the bag in the anti-corruption investigation on Jo Davidson and Ian Buckells and work out who has got the pair of them right where they want them? If they manage to crack the case, could it be enough to save Ted's job and AC-12?

Ryan Pilkington Line of Duty

Ryan has made it very clear to Jo that he is watching her every move.  (Image credit: BBC/World Productions)

When will Steve Arnott read his email from Occupational Health? 

Following his not-so-random drugs testing in Season 6 episode 3, something in his results has clearly caught the eye of occupational health. Whatever they have found is obviously a pressing matter considering the urgent nature of their email, but how much longer can Steve go on just deleting the messages? Have they uncovered his painkiller addiction? Or is there something else that has been flagged up by the results? 

Line of Duty continues on Sunday nights at 9pm on BBC One. You can catch up on past seasons and missed episodes on BBC iPlayer

Claire Crick
Assistant Managing Editor at What To Watch

Claire is Assistant Managing Editor at What To Watch and has been a journalist for over 15 years, writing about everything from soaps and TV to beauty, entertainment, and even the Royal Family. After starting her career at a soap magazine, she ended up staying for 13 years, and over that time she’s pulled pints in the Rovers Return, sung karaoke in the Emmerdale village hall, taken a stroll around Albert Square, and visited Summer Bay Surf Club in sunny Australia. 

After learning some tricks of the trade at websites Digital Spy, Entertainment Daily, and Woman & Home, Claire landed a role at What’s On TV and whattowatch.com writing about all things TV and film, with a particular love for Aussie soaps, Strictly Come Dancing and Bake Off

She’s interviewed everyone from June Brown — AKA Dot Cotton — to Michelle Keegan, swapped cooking tips with baking legend Mary Berry backstage at the NTAs, and danced the night away with soap stars at countless awards bashes. There’s not a lot she doesn’t know about soaps and TV and can be very handy when a soapy question comes up in a pub quiz! 

As well as all things soap-related, Claire also loves running, spa breaks, days out with her kids, and getting lost in a good book.