 With no time to mourn, the group come across the room where all the ymbrynes are being kept, but Caul already knows that Jacob and Emma are here.He then threatens to release a whole horde of hollows into the room with them and the ymbrynes unless Jacob is willing to use his ability to help him find the soul jars hidden in the legendary Library of Souls - a place where it was rumored peculiars kept their souls after their death for others to borrow later, but was later cut off from the rest of peculiardom after a horrible war that was also responsible for scattering peculiars across the world.Despite that, Jacob does not give in to Caul's demands and instead uses his ability to control the hollows.