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.

This book features in the following series: Interworld, Interworld Series .

This book has been graded for interest at 11+ years.

There are 288 pages in this book. It is a novel. This book was published 2015 by HarperCollins Publishers .

Neil Gaiman won both Newbery and Carnegie Medals for The Graveyard Book. Coraline was made into an Academy award-nominated film. He has also won the Hugo Award and the Nebula Award. Michael Reaves is an Emmy award-winning TV writer. He's also been nominated for a second Emmy, won a Howie Award and was nominated for a Hugo and a Nebula Award.