Two years after Jack, Bob, and King Mohammad escaped from the Scientist's fortress, they must return and purposely infiltrate his dreadful base. Meanwhile, when Vorada is threatened, British and Massawan troops storm in to save the day. Vorada's power of invisibility helps, but thousands of Nazi and Occidere soldiers will test the island's defenses to the limit. Will everything work out? Or will Lord Occidere succeed in destroying their beloved island?