There have been seals on Merrow Rock for as long as anyone could remember. What few people seem to know is that there are a whole more to those seals than meets the eye. Rawly had a fear of the water after an accident seven years ago, but he was determined to face it. While doing so, he meets an eccentric lighthouse keeper named Admiral Nye Porter. He also comes upon six selkies in a marine biology lab, without their sealskins and unable to swim. Now Rawly has to find a way to save the selkies and help them find their sealskins. Without them, they'll be stuck on land, unable to return to the sea or Merrow Rock.