The Lost Souls have protected the famous treasure on Island X from the pirates. But now, a mysterious predator is prowling around their camp: a ferocious black panther. And with Captain Scarlet McCray stuck in Port Aberhard learning how to be a proper lady, Jem Fitzgerald is left to command the crew, protect the treasure, and keep tabs on both the panther and a new pirate captain, determined to best every pirate in the Islands.