Three Years Into The Job… Grace, Tommy And Annie Are About To Face Their Most Dangerous Case Yet. Blue Lights returns for Series 4 on September 29, bringing back the officers fans have followed — but this time, a new threat is pushing the police to their limits. As Gerry Cliff’s murder trial exposes a long-buried secret, chaos begins spreading through both the force and the criminal underworld. Nathan Braniff has already teased “big stunts,” pyrotechnics and plenty of “craziness” — while Tommy’s personal life is set to become even more chaotic. Four seasons in, the stakes have never felt higher.

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Blue Lights Returns for Series 4 With a New Threat and ‘Craziness’ Ahead

The wait is almost over for fans of Blue Lights, with the BBC confirming that the acclaimed Northern Ireland-set police drama will return to screens later this month.

Series 4 premieres on September 29 at 9pm on BBC One, picking up with Grace Ellis, Tommy Foster and Annie Conlon three years into their careers as response officers. This time, however, the challenges facing the trio are set to become more dangerous than ever.

The new series promises a story that pushes the officers to their limits, as they encounter a threat that even the police are struggling to contain.

Two individuals dressed in police uniforms are standing side by side, facing forward. The person on the left is wearing a black jacket with reflective patches and a police badge on the left side of the chest. The person on the right is wearing a black jacket with the word "POLICE" prominently displayed on the back in white letters. They appear to be engaged in a conversation, with their attention directed towards something in the foreground. Behind them, various posters and signs are visible, suggesting an indoor setting, possibly a police station or office environment.

A dangerous new chapter for Grace, Tommy and Annie

The fourth series finds Constables Grace, Tommy and Annie increasingly stretched by the realities of life on the streets.

The official synopsis reveals that a new danger is emerging, while the murder trial of Gerry Cliff begins to expose a long-buried secret. What follows threatens to create chaos both within the police and throughout the criminal underworld.

As the three officers are forced to make major decisions about their futures, they must also confront what is described as “the greatest threat they have ever encountered” — the truth.

That combination of police pressure, criminal activity and personal uncertainty looks set to drive the new season as the characters face consequences that reach far beyond their everyday duties.

A familiar cast returns

Two uniformed individuals, presumably law enforcement officers, are standing next to a yellow vehicle. They are both dressed in black tactical uniforms and caps. The background features a red brick wall.

The fourth series brings back many of the show’s central performers.

Siân Brooke returns as Grace Ellis, alongside Martin McCann as Stevie Neil, Katherine Devlin as Annie Conlon and Nathan Braniff as Tommy Foster.

The returning cast also includes Joanne Crawford as Chief Inspector Helen McNally, Andi Osho as Sandra Cliff, Frank Blake as Shane Bradley, Abigail McGibbon as Tina McIntyre, Dearbháile McKinney as Aisling Byrne, Neil Keery as Sergeant Lawrence McCloskey and Andrea Irvine as Chief Superintendent Nicola Robinson.

There will also be some notable returning faces and new additions to the story.

Richard Dormer reprises his role as Gerry Cliff in a special one-off episode, while Cathy Tyson joins the series as Dana Morgan, the owner of a private members’ club. Hannah McClean plays solicitor Jen Robinson, Jonathan Harden returns as Inspector “Jonty” Johnston, and Michael Smiley appears as C3 intelligence officer Paul “Colly” Collins.

Nathan Braniff promises a bigger, more chaotic season

A group of police officers in a corridoor

Nathan Braniff has already offered fans a glimpse of what they can expect from the new episodes, suggesting that the latest instalment will retain the qualities audiences have come to love while taking the action even further.

Discussing Tommy’s storyline, Braniff said the character will be working through his relationship, describing the situation as increasingly chaotic.

He also teased a production filled with large-scale moments, including stunts and pyrotechnics, promising plenty of “craziness” along the way.

The comments suggest that while the personal and emotional storylines remain central to Blue Lights, the fourth series will also bring a greater sense of scale and physical danger.

Behind the BBC drama

Marty McCann in Blue Lights

Blue Lights was co-created, written and executive produced by Declan Lawn and Adam Patterson. Stephen Wright is also credited as co-creator and producer, while Louise Gallagher serves as co-creator and co-producer.

The series is produced by Two Cities Television and Gallagher Films, with support from Northern Ireland Screen.

Now, with its fourth series about to begin, Blue Lights is returning with its core characters facing perhaps their most difficult period yet — and with a buried truth threatening to shake both the police and the criminal world around them.

Blue Lights returns Tuesday, September 29 at 9pm on BBC One.