The whale without a tail

Alex, the little sailor, sneaks on board of a ship. He wants to sail the ocean and see whales for real. He finds, together with the captain and his two sailors a whale with an impaired tail. All four sail off to a distant island to call for help. On the island Alex thinks of a plan to give the whale a new tail. Will they succeed to make Alex' plan work? - Suited for children of 3 -9 years old.