 Here it is discovered that like his grandfather before him, Jacob is the only one who can see the soul jars hidden within the library.With Caul holding his friends hostage, Jacob obediently procures the most powerful soul jars for Caul and his brother, with the other wights dying because of ingesting the souls like ambrosia and not pouring them into a well where the souls can successfully bond with the user.Miss Peregrine's brothers grow into gigantic monsters who eventually end up dueling each other, but thanks to a recipe given to Jacob by Bentham that's used by the ymbrynes as the fight goes on, the library collapses in on Caul and Bentham.