From best-selling author R.L. Stine comes the next spooktacular chapter in the Mostly Ghostly series. Max Doyle must find an enchanted gem to stop an invasion of evil spirits.From best-selling author R.L. Stine comes the next spooktacular chapter in the Mostly Ghostly series. Max Doyle must find an enchanted gem to stop an invasion of evil spirits.From best-selling author R.L. Stine comes the next spooktacular chapter in the Mostly Ghostly series. Max Doyle must find an enchanted gem to stop an invasion of evil spirits.