Matilda, Jim Lad and the Jolley-Rogers are drawn to a mysterious cave and bewitched by a magical haul of treasure.

Every full moon, a mysterious ship is seen off the coast of Dull-on-Sea. Then, the next day, gold and jewelry are missing from homes, shops, and museums all over town. Matilda needs the Jolley-Rogers' help to investigate. Can Matilda and Jim Lad retrieve the stolen booty from the mysterious ship before the moon fades? Or will they end up stuck on board with a crew of ghostly pirates forever?

Though Anders and his friends have delayed a war between ice wolves and scorch dragons, their mission is far from over. With adults on both sides looking for them, they've sought refuge in Cloudhaven, a forbidden stronghold that could hold the key to saving their home. Meanwhile, Holbard has been ravaged, and its citizens are reeling. Many have been forced into bleak camps outside the city, and food is running short. To rebuild Vallen and unite scorch...