Under Salt Marsh is a British crime thriller miniseries created by Claire Oakley, set in the fictional North Wales village of Morfa Halen. When teacher and former detective Jackie Ellis discovers the drowned body of her eight-year-old pupil Cefin Hill as a storm gathers, the death reopens a three-year-old disappearance that ended her career. Detective Eric Bull returns to lead the investigation as community secrets emerge across six episodes.