At its heart are former social worker Grace Ellis (Siân Brooke), sheltered newcomer Tommy Foster (Nathan Braniff) and Annie Conlon (Katherine Devlin), who began the series as rookie officers. Since then, their loyalties have been tested, while the Blackthorn family has expanded to include seemingly abrasive Shane Bradley (Frank Blake). The murder of veteran officer Gerry Cliff (Richard Dormer) in series one has also continued to cast a long shadow.
Now, as series four arrives, billed as “their toughest shift yet”, Grace is increasingly disillusioned, while Tommy’s personal and professional lives threaten to unravel. Shane, meanwhile, is discovering just how much his Blackthorn family means to him.
Gerry’s murder trial also hangs over the station, while Richard Dormer makes a much-anticipated return as the drama revisits events that promise to reveal new truths.
Here, Siân Brooke, Nathan Braniff and Frank Blake share how life on the front line has transformed their characters and hint at what’s in store this series.
WHERE DO WE FIND YOUR CHARACTER AT THE BEGINNING OF SERIES FOUR, AND HOW HAS THE ROLE CHANGED THEM?
SIAN: Grace feels she’s found her calling in child protection, which has driven her to take her detective exams, but because of bigger factors at play she realises progression isn’t going to happen. She is also stepping between frontline policing and this world of dark shadows when working alongside Colly [the intelligence officer, played by Michael Smiley]. I have always seen Grace as able to maintain this optimism, but she becomes extremely disillusioned in this series.
NATHAN: For Tommy, it’s very much picking up where he left off with [fellow constable] Aisling [Dearbháile McKinney]. The pressure of the job has really taken its toll on their relationship and they’re trying to work through their problems. He came into the role totally green and sheltered and was thrown into this crazy environment, so he has had to grow up quickly. There is so much pressure, he’s at his wits end personally and professionally.
FRANK: Shane’s accident [when he was stabbed] at the end of series three put a lot into perspective. It was up in the air whether he’d return, but he has realised who he values and who values him, which is the guys around him and the people he gets to take care of on the streets of Belfast. I’ve loved exploring the softer, more humorous side of Shane. I think he’s got a good heart; maybe he was just a bit misguided when he arrived.
WHY DO VIEWERS CARE SO MUCH ABOUT THESE CHARACTERS?
SIAN : They’re depicted as real people with real lives. There’s that gallows humour when you’re dealing with extreme situations. As for Grace and Stevie [Martin McCann], people became invested because it was a slow burner. They’re two people in their mid-40s who’ve had their fair share of love lost, but they’re essentially good people. Their banter is a bit like a tennis match.
FRANK: First and foremost, it’s about the characters rather than one big plot. Through them we get to explore Belfast and see a more genuine, human version of the city rather than being tied up in the same stories we saw in the media for years.
WHAT CAN YOU TELL US ABOUT GERRY’S RETURN?
SIAN: It feels like it’s come full circle. Sadly, my storyline and Richard’s didn’t cross, but at the read-through it was nostalgic having him back in the room where it all began four years ago. Some big truths will be uncovered this series.
NATHAN: Every time we did a panel with the writers, someone would ask, “Why did you kill off Gerry?” I feel like they were almost left with no choice but to bring him back in some sense! I think people are going to freak out when they see the episode.
WHY DOES BELFAST REMAIN SO IMPORTANT TO BLUE LIGHTS ?
SIAN: They’ve written a cop show about Belfast, but it encompasses every aspect of this brilliant place and its history, all the ingredients that make it what it is today, and they dissect it in a very human form.
FRANK : Declan and Adam have written things that, before the show has even come out, have been mirrored in the news. But what makes it special is the characters and the genuine, human version of Belfast we see through them.
WHAT HAVE YOU PERSONALLY TAKEN AWAY FROM FILMING BLUE LIGHTS ?
NATHAN: A greater understanding of police work. It’s a tricky job. You’ve got this added element of danger with all the politics that goes on with Northern Ireland, and no matter how hard you try, it’s probably a job that it’s going to be hard to do perfectly all the time.
FRANK: My big takeaway from playing Shane is how much difference you can make to someone’s day by giving them 10 or 15 minutes of your time. You don’t know if you could change someone’s life simply by asking how they are, checking in or humanising someone who may not be treated like a person in their community.
SIAN: I’ve been doing this [acting] for 23 years and when you make something, you’ve got no control over whether people jump on board. The show has given me the most wonderful gift of a place, friends and people. I miss Belfast when I’m not there. I feel very blessed that it’s become such a great part of my life.
Blue Lights returns on Tuesday 29 September, with all six episodes on BBC iPlayer that morning and episode one on BBC One at 9pm
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