Cedric the Swordfish is the Marine Federation's newest and most enthusiastic recruit, and it's just as well, because his new job is a very big one... To protect the sea and all its marine-life.

With the help of his clever robot friend Greg, lots of useful sword attachments and two small children who are spending the summer in a local lighthouse with their Gramps, Cedric has everything he needs to complete his very first mission. Rescuing a ship full of Olympic medals that has crashed into the rocks during a storm. But Cedric needs to be careful. He's not the only one interested in those shiny, valuable medals.