The gang decide to find out where the Headmaster came from and stumble on an intriguing clue that sends Lizzie, Ethan and Angelika on an exciting adventure. Following the clue leads them to an abandoned school, and they set off on a scary treasure trail around the building. Is whoever set this trying to help them, or is it a trap?

The gang get excited that they're not alone - someone else knows about the Headmaster! They hope that rescue is on its way, but their search for whoever left the message is fruitless - until a mystery teacher with attitude shows up. Who is she?

Blake takes drastic action against the Headmaster and the gang try and turn it to their advantage, but end up revealing painful secrets that could change everything.