Morfa Halen is a tight-knit Welsh town precariously nestled between towering mountains and a fast-encroaching sea that threatens its very existence. As a once-in-a-generation storm begins to gather far out at sea, former detective turned teacher Jackie Ellis discovers the body of her 8-year-old pupil, Cefin, seemingly drowned. The discovery sends shockwaves through the community, reviving the ghost of an unsolved cold case that rocked the town three years prior - the disappearance of Jackie’s niece, Nessa, which cost her career.

Under Salt Marsh poster

Under Salt Marsh (2026)

No secrets are safe from the storm.

★ 6.6/10 January 30, 2026 1 season

CrimeMystery

Creator: Claire Oakley  ·  Writers: Claire Oakley, Jonathan Harbottle, Nikita Lalwani

Morfa Halen is a tight-knit Welsh town precariously nestled between towering mountains and a fast-encroaching sea that threatens its very existence. As a once-in-a-generation storm begins to gather far out at sea, former detective turned teacher Jackie Ellis discovers the body of her 8-year-old pupil, Cefin, seemingly drowned.

The discovery sends shockwaves through the community, reviving the ghost of an unsolved cold case that rocked the town three years prior - the disappearance of Jackie’s niece, Nessa, which cost her career.

Trailer

Creators

Claire Oakley Claire Oakley

Cast

Kelly Reilly Kelly Reilly Jackie Ellis Rafe Spall Rafe Spall Eric Bull Naomi Yang Naomi Yang Jess Deng Harry Lawtey Harry Lawtey Dylan Rees Dino Fetscher Dino Fetscher Gareth Morgan Dinita Gohil Dinita Gohil Nisha Jones Kimberley Nixon Kimberley Nixon Shell Hill Julian Lewis Jones Julian Lewis Jones Osian Northam Jonathan Pryce Jonathan Pryce Solomon Bevan

User Reviews (3)

annatv22
annatv22 February 1, 2026
★ 10/10

Moody Welsh crime drama with a standout Kelly Reilly and strong supporting cast. A slow burn at first, but rewarding once it finds its pace. Highly recommend.

MovieGuys
MovieGuys February 21, 2026
★ 6/10

Strong cast, intriguing crime thriller, but as per usual let down by dreary DEI baggage. Let's start with the positives: the Welsh setting with a village under siege by rising ocean levels is a little unique. The crime drama, which spans two unsolved murders of children, is darkly disturbing with lots of twists and turns. Equally quality acting offers up well-rounded, often flawed characters. The downside is by now wholly predictable. The incessant need to ram DEI messaging down the viewer's throat. Personally I find it downright tiresome and pointless. In summary, it could have been a great series, but it's spoilt to a decent degree by the compulsion to inject woke narratives into what is supposed to be entertainment. An okay watch.

tender_buttkiss
tender_buttkiss September 5, 2026
★ 4/10

Underwhelming. What could've been a gritty crime drama with a unique setting just gets bogged down by the interpersonal drama of the two lead characters. And I honestly couldn't give a crap about either. The red head one is carrying this bigole pity party on her back cause she stupidly thought her own sister may have killed her own child. And theother dudeid an unapologetic asshole with no clear reason why. Maybe cause he's closeted? Who cares. If this was set in the 90s or aby decade earlier, I'd buy that. Tough cop character who's risen in the ranks, but homophobia and a toxic workplace keeps him from showing who he truly is. But it's not. Get over it. Love who you love and move the fuck on. I haven't watched the final episode yet but I'm hopeful all the characters die causemostof them are miserable, insufferable cunts. Except for Deng, she can live.