Under Salt Marsh
Under Salt Marsh is a British crime thriller television miniseries created by Claire Oakley and starring Kelly Reilly and Rafe Spall in the lead roles. The series premiered on 30 January 2026 on Sky Atlantic.
Premise
As a huge storm starts to form far out at sea, a teacher and former detective, Jackie Ellis, finds the body of her 8-year-old student, Cefin, who appears to have drowned. This shocking discovery stirs up the town's memories of an unresolved case from three years earlier—the disappearance of Jackie’s niece, Nessa, which ruined her career.Cefin's death brings back Jackie's old partner, Detective Eric Bull, to lead the investigation in a community where he previously failed. Believing the two cases are connected, Jackie and Bull must work together to uncover hidden secrets in Morfa Halen before the storm hits and wipes away any evidence.
Cast and characters
Episodes
Production
The six-part series is created by Claire Oakley, who also directs with Mary Nighy. Scott Bassett serves as the series producer while Oakley executive produces alongside Elwen Rowlands for Little Door Productions and Megan Spanjian for Sky Studios. Kelly Reilly was cast in the lead role in August 2024. In October 2024, the full cast for the series was announced, with Rafe Spall, Jonathan Pryce, Naomi Yang, and Harry Lawtey in main roles while the supporting cast includes Dinita Gohil, Brian Gleeson, Kimberley Nixon, Mark Stanley, Dino Fetscher, Lizzie Annis, Rhodri Meilir, and Julian Lewis Jones.Filming began in October 2024, with the production taking place entirely in Wales. Locations used include Barmouth, Fairbourne, Anglesey and South Wales. Support for the project comes from Creative Wales..