Stinky McFlea, Irish Stew, Long Johns, Nitty Nora and Captain Spratt are pirates aboard the Salty Herring. They love nothing more than lazing about on deck and sailing the high seas - until one day, a strange wailing noise changes everything. There’s a stowaway baby on board the ship, and the crew have decided to raise him like a proper pirate. But are they really up to the task of looking after a baby? And where exactly did Nappy come from?