Not only do we have a trailer for the chilling series, but we now also know when it will be landing on our screens. It's now been confirmed that Under Salt Marsh will launch on Sky and streaming service NOW on Friday 30th January 2026.
If the trailer's anything to go by, it'll be the kind of series that will leave you wanting to binge-watch it in one go, as a cold case mystery continues to shake up a close-knit Welsh town.
We then see that despite turning her back on policing, that hasn't stopped Jackie from investigating the tragic cases of two children, one who died and another who went missing just three years apart. Are they connected? Well, that's something she's trying to get to the bottom of, but in such a tight-knit community where secrets are held tightly, it proves to be an almost insurmountable task.
You can watch the trailer for yourself below.
View oEmbed on the source websiteAs per the synopsis, Under Salt Marsh "opens as a once-in-a-generation storm rolls in from the sea. Former detective turned teacher Jackie Ellis (Reilly) makes a shocking discovery that reopens the wounds of a three-year-old cold case which cost her both her career and her family’s trust".
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It continues: "Forced to reunite with her estranged police partner Eric Bull (Spall), Jackie is drawn back into an investigation that will shake Morfa Halen to its core. Together, they must confront a community haunted by secrets and fractured by grief, before the incoming storm washes away the evidence forever."
As well as Spall and Reilly leading the cast of the new crime drama, additional cast includes Naomi Yang (Chimerica), Dinita Gohil (Treason), Kimberley Nixon (Fresh Meat), Dino Fetscher (Fool Me Once), Lizzie Annis (The Witcher: Blood Origin), Rhodri Meilir (Pren Ar y Bryn), and Julian Lewis Jones (House of the Dragon).
Read our guide to the best Christmas TV for 2025.
Check out more of our Drama coverage or visit our TV Guide and Streaming Guide to find out what's on. For more TV recommendations and reviews, listen to The Radio Times Podcast.
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