 The group then frees Miss Peregrine and the rest of the trapped ymbrynes and fight their way through the building.The peculiar children manage to keep up a good fight, but in the end are betrayed by Bentham, who wanted nothing more than to prove he could do some good for Miss Peregrine after she banished him, but sought revenge after she refused to forgive him.Caul takes the rest of the peculiars and ymbrynes hostage and forces them along with him to the Library of Souls, which Caul had managed to successfully rediscover.