Sky has released the first images from its upcoming six-part crime series Under Salt Marsh, starring Yellowstone's Kelly Reilly as a former detective turned teacher. The show, set and filmed in Wales, has already drawn praise from critics ahead of its late January release. It features a cast of notable Welsh actors and unfolds in the fictional town of Morfa Halen amid a storm and a mysterious death.
Under Salt Marsh centers on Jackie Ellis, played by Kelly Reilly, who once served as a detective but now teaches after an unsolved case devastated her family and career. The story begins as the coastal community of Morfa Halen braces for a rare storm. Jackie discovers the body of her eight-year-old pupil, Cefin, who appears to have drowned, stirring memories of her niece Nessa's disappearance three years earlier.
The series reunites Jackie with her former partner, Detective Eric Bull, who returns to investigate and redeem himself to the locals he previously let down. Filming occurred across Wales, starting on Anglesey in early 2025, including locations like Aberffraw village, visible in the trailer, as well as Newborough Forest, Malltraeth, and Menai Bridge. Production continued in Gwynedd, with scenes shot on Barmouth's promenade in October 2025, plus Fairbourne and Llanbedr.
Joining Reilly are acclaimed Welsh performers such as Sir Jonathan Pryce, known for his role as Prince Philip in The Crown, portraying Solomon Bevan. Kimberly Nixon from Fresh Meat also stars, alongside Harry Lawtey, who depicted Richard Burton in the film Mr Burton, and fellow Welsh actors Dino Fetscher, Rhodri Meilir, and Julian Lewis Jones. The fictional town name Morfa Halen translates to Salt Marsh in Welsh, reflecting its seaside setting.
Critics have lauded the drama before its premiere at the end of January, highlighting its tense narrative and strong ensemble.
