Brought up by a wonderful group of animals on a hidden island somewhere deep in the Caribbean, Jim knows no other life or who his real parents are. He washed up on the island as a baby in a barrel of rum and treasure, and has been helping run its special lighthouse with the animals ever since. But now, trouble is brewing ...

Someone, or something, has stolen the lighthouse bulb filaments. If Jim, Oscar and the rest of the animals can't get the lighthouse beams working again, the hidden island will no longer be a secret. And with a pirate ship on the horizon, danger is about to smash their tranquil island apart ...