When Professor Kate sneaks away to the Dark Mountain in the middle of the night, siblings Pirie and Henry can't resist following their mysterious teacher. Using Pirie's shapeshifting abilities and Henry's invisibility powers, they venture into the mountain's dangerous cave system where they encounter a group of unusual goblins who warn them about the cave trolls. But something strange is happening underground - the supposedly friendly trolls now have glowing red eyes and are attacking without warning! What secret is Professor Kate hiding in these caves? Join the magical adventure as Pirie and Henry navigate treacherous tunnels, form unlikely goblin alliances, and uncover a mystery that could threaten The Academy itself.

Perfect for kids who love magic schools, fantasy adventures, and stories about siblings working together to solve mysteries!

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