Airdate: Under Salt MarshThe body of a pupil and a once-in-a-generation storm collide in a UK crime thriller. UK crime thriller Under Salt Marsh premieres tomorrow on Binge. Under Salt Marsh is a storm-lashed thriller filled with secrets and shattered lives, haunting and unforgettable. The series begins as former detective turned teacher Jackie Ellis, played by Kelly Reilly (Yellowstone) discovers the drowned body of her eight-year-old pupil. The shocking find reopens wounds from a cold case that destroyed her career: the disappearance of her niece three years earlier.