Daydreamers - The Dreamer Chronicles, #6

Captured by the school, and thrown in to it's most elite prison, Julie is isolated from the people she loves most, and is tasked with rescuing Harry, saving herself, and stopping the apocalypse. As you do. With the school and the Petersons closing in on her from opposite sides of the same fight, Julie has no choice but to rise up to her destiny in the fight of her life. But things aren't as they seem, and a sacrifice will have to be made to keep the world from splintering.
Daydreamers is the sixth and final book in The Dreamer Chronicles.