Eternity's Wheel (Interworld, Book 3) by Neil Gaiman
The heart-pounding conclusion to the InterWorld series, by award-winning writers Neil Gaiman, Michael Reaves and Mallory Reaves
As the threat of FrostNight looms ever closer, Joey Harker seeks out more of his fellow Walkers across the Altiverse, training them as fast as he can. But even a solid team of recruits can't prepare Joey for the ultimate showdown with InterWorld's enemies, old and new.
Joey never wanted to be in charge. But he's the one everyone is looking to now, and he'll have to step up if he has any hope of saving InterWorld, the Multiverse, and everything in between.