School's Out-Forever by James Patterson

After their last wild adventure, the Flock members are taken under the wing of an FBI agent and try to live "normal" lives by going to school, making friends -- and continuing their relentless search for their parents. But the Erasers return, forcing the Flock to abandon their search and make their escape once again. The voice inside Max's head keeps telling her that it's up to her to save the world, but this is especially challenging to do when she is faced with her ultimate match: a newer and better version of herself, Maximum Ride II. Max's heart-stopping quest to investigate the mind-blowing mystery of her ultimate destiny continues in the scariest, strangest, and funniest James Patterson novel yet.