Library of Souls (Book 3:Miss Peregrine’s Home for Peculiar Children series) by Ransom Riggs

Following the events of Hollow City, Jacob, along with Emma Bloom, must rescue their captured friends and uncover the truth behind the villainous Wights and Hollowgasts. Their quest leads them to the Library of Souls, a legendary place containing the collected souls—and powers—of all peculiars.

As Jacob learns more about his unique ability to control Hollowgasts, he must embrace his role in the fate of the peculiar world. Along the way, alliances are tested, secrets revealed, and the battle for the survival of peculiardom reaches its climax.