The Pirate Queen's Treasure

Thanks to successfully solving the case of the stolen ruby, Mystery’s brother and sister—and their faithful butler, Mr. Kent—went to relax on the island of Bali. But their vacation was disrupted by the disappearance of their Siberian cat Watson, who was kidnapped by villains. To free the cat, a ransom was needed—a priceless antique chess piece belonging to the famous pirate queen.