The Rookies Grow Up in ‘Blue Lights’ Season 4’s First Images
The first images from 'Blue Lights' Season 4 show how much our cast has grown.
Blue Lights holds many stories inside its police procedural framework. Technically, the show is a crime-of-the-week series with a season-long arc tying episodes together. It’s a fish-out-of-water story about a middle-aged housewife who becomes a rookie cop, a workplace comedy about the ridiculousness of bureaucracy, and a crooked cop drama set in the shadow of a city scarred by The Troubles.
But perhaps the most important tale hidden inside Blue Lights is that it’s a coming-of-age story. Grace Ellis (Sian Brooke), our middle-aged housewife, is as naive about the world as her 18-year-old co-workers Annie Conlon (Katherine Devlin) and Tommy Foster (Nathan Braniff) when the series begins. The series is centered on their education (and ours) of the reality of Belfast’s struggles since the Good Friday Accords.
It’s why, in the end, the series has never really been “The U.K.’s Answer to The Wire,” as much as American critics would like to have such an easy rubric. Blue Lights pulls its punches in that department, partly because it loves these characters too much to really hurt them the way the world actually would. Besides, this is their story and their time to grow up – something that’s apparent in the faces of the show’s youngest leads, who look so much older than they did when the series began.
Here’s the Season 4 synopsis:
Three years into their jobs as response officers, Constables Grace Ellis, Tommy Foster, and Annie Conlon are operating at their limit, facing a new threat on the streets that the police can barely control. Meanwhile, the murder trial of Gerry Cliff exposes a dangerous and long-buried secret that leads to chaos both inside the police and across the criminal underworld. As they grapple with big decisions about their future, Grace, Tommy, and Annie must find the courage to face the greatest threat they have ever encountered: the truth.
Sian Brooke (Trying), Katherine Devlin (The Day of the Jackal), and Nathan Braniff (Homo Hibernicus) are once again joined by Michael McCann (Trespasses), Joanne Crawford (Outlander: Blood of My Blood), Andi Osho (The Sandman), Frank Blake (Say Nothing), Dearbháile McKinney (Kneecap), Andrea Irvine (Call The Midwife), and Abigail McGibbon (Ballywalter).
Season 3 additions Cathy Tyson (Dune: Prophecy) and Michael Smiley (Bad Sisters) also return for the new season, as will Richard Dormer (COBRA) and Jonathan Harden (Time), reprising their respective roles as Gerald Cliff and Inspector Jonty for the first time since Season 1. Hannah McClean (Sick Note) will also return as solicitor Jen Robinson after sitting out Season 3.
Series creators Declan Lawn and Adam Patterson once again co-wrote all six episodes, with director Angela Griffin returning to split helming duties with Sam O’Mahoney (The Wise Guy), with Brendan Mullin producing. Lawn and Patterson co-created the series with Stephen Wright; the three executive produce alongside Louise Gallagher and Nick Lambon for the BBC.
Blue Lights Season 4 is expected to debut in the U.K. before the end of 2026 and will follow on BritBox in late 2026/early 2027. Seasons 1 through 3 are streaming on BritBox.
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