After beating the pirates to Island X and its treasures, Scarlet and Jem and the rest of the Lost Souls have now settled on the island. While Uncle Finn wanders the island in search of rare plants, Jem tries to construct tree houses, and Scarlet deals with her newfound ability to channel the feelings of the islands animals. But everything is thrown into disarray when the Dread Pirate Captain Wallace Hammerstein-Jones and his crew, including the traitor Lucas Lawrence, come back to the island. Things get even more worrisome when a troop of Kings Men appearled by Scarlets father! Can they keep the pirates from the rubies and prevent the Kings Men from plundering the islands treasures? The Lost Souls have to use all their witsalong with help from some surprising island inhabitantsto keep Island X safe.