Maximum Ride. Volume 2: James Patterson

Having rescued Angel from the horrors at the School, the flock heads east to escape the Erasers. But the danger's not over yet. Whether in the treetops of Central Park or the bowels of the Manhattan subway system, Max and her adopted family are on the ride of their lives. Along the way Max discovers from her old friend and father-figure Jeb - now her betrayer and greatest enemy - that her purpose is to save the world. But can she? The Angel Experiment concludes in volume 2!