Under Salt Marsh — Season 1, episode 1 watch online

Under Salt Marsh, season 1 episode 1: air date January 30, 2026. Episode overview, season trailer and the cast of Under Salt Marsh.

Former detective turned teacher Jackie Ellis discovers the body of 8-year-old pupil Cefin, seemingly drowned. The discovery sends shockwaves through the community, reviving the wounds of an unsolved case that rocked the town three years prior - the disappearance of Jackie's niece Nessa, which cost her career.