I enjoyed Eternity's Wheel more than the first two books of the InterWorld trilogy. As with the preceding books, Neil Gaiman's name appears at the top of the authors list, but it was actually written by Mallory Reaves with her father Michael assisting with the ideas.
This book wraps up the FrostNight saga that began in volume 2 - The Silver Dream.
The villains of Binary (which derives their power from science) and HEX (which derives their power from magic) have launched FrostNight in order to destroy all the different earth's from the different dimensions in order to take dominion over the chaos that remains. Joey Harker and the countless other versions of himself that make up InterWorld are battling to stop them. They are assisted by Timewatch - a police force that seeks to stabilize threats to the time stream.
The book is not complex but it introduces some interesting new characters and evolves some existing ones; and includes some clever possible time loop twists.