Who would you save? The Fae and human worlds are merging at a rapid pace, leaving Kat two options; crash with the rest of them or ride it out and claim her place. With both of Kat's knights out of the picture, it's up to her to face new dangers and defeat old enemies. But with Kat's new powers still on the fritz and her most trusted companion no longer at her side, this librarian has to decide what's worth saving and what will be sacrificed. Only one question remains: Can Kat save the Underground if she can't even save herself?