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 …