City boy, Robert MacSpoon, is reluctant to leave Edinburgh for a new life on the remote Scottish island of Rum when his family relocate there. But little does he know what wild adventures are awaiting him on this mysterious island. When he meets an old ship's captain, he listens to exciting tales of long lost pirates. Then, the unthinkable happens and he stumbles into a time travelling tunnel and is transported back hundreds of years to a place where pirates ruled the high seas. But now, he's no longer an ordinary boy. He's the captain of a pirate ship with its very own crew of children in the middle of the Caribbean. And it's not long before he's doing battle with the resident buccaneers for hidden treasures and often just to stay alive. The buccaneers are not his only concern though, as he fights to maintain order aboard his ship. All the while trying to find a way back home.