Jestro, the Book and their monsters are still on the loose, causing havoc all over the kingdom. No place is safe. In their relentless search for the lost magical Books, they are growing ever powerful and it will only be a matter of time before they can conquer the entire kingdom. The NEXO Knights are now an efficient monster-fighting unit, but even so, they have to upgrade their equipment and NEXO powers to keep up with the ever-growing threat. Dark secrets from the past start to reveal themselves in the deep memory of holographic wizard Merlok 2.0 as it becomes unclear who the real enemy master mind is: Jestro or the Book of Monsters?