After a series of adventures with wild animals and Indians on the island, D’Artacan and Pom hide in a cave where they discover a brilliant gem. They emerge to see the Blue Hawk’s ship approaching. D’Artacan tries to fight them off alone, and then is helped by a Spanish naval vessel which has picked up the Three Muskehounds. They defeat the Blue Hawk gang and recover the three most valuable gems in the world.
