When transfer students Pirie and Henry discover mysterious red crystals buried around The Academy, they realize their teacher's strange behavior might be part of a sinister magical plot. With their new friends Lucy and Holly, they uncover an ancient form of mind control magic that threatens everyone at the school. As Professor Kate's true intentions become clear, the young wizards must gather evidence and allies before it's too late.

When Pirie and Henry discover that the cave trolls' glowing red eyes might be connected to ancient banned magic, they recruit their friends Lucy and Holly to help investigate. The children learn that Professor Kate's midnight trips to the Dark Mountain may be part of a larger plot involving The Academy itself. With help from their goblin allies and the purple dragon Hamish, they race to uncover the truth about the mysterious crystals before it's too late.

Perfect for kids who love magical adventures, friendship stories, and thrilling mysteries!

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!