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.

Lizzie wakes up in the Headmaster's efficient future, where life is productive and safe. Can she make everyone she cares about realise this is a trap before it's too late?