The Host wants to know what the Academy was trying to hide and why the Fallen agreed to it. They want the Instrument of War, the one thing that can tip the Eternity War in their favor and put an end to the stalemate. Any impact on the Academy staff, students or buildings is just collateral damage.
Mitch would like to forget that the last year ever happened, but that doesn't seem likely with Little Red Riding Hood now teaching Teratology. The vampire isn't quite as terrifying as he first thought, but she's not the only monster at the Academy. The Fallen are spying on everyone, the new Principal is an angel, and there's an enchanting exchange student with Faerie blood.
Angry and nervous of the angels surrounding him, Mitch tries to put the pieces together. He knows that Hayley is the Archangel Gabriel. He knows that she can determine the course of the Eternity War. He also knows that the Fallen will do anything to hide Gabriel from the Host—even allowing an innocent girl to be kidnapped.