Children's fiction, adventure. The crew of kids we have followed through the series gear up for the final battle against the Evoker King. But they run into a glitch where they can't use their weapons, or build, or do much of anything in Minecraft anymore. What's going on? To figure it out, they have to bring on another student, one they have resisted working with so far. Can they defeat the evoker king? A nice wrap-up of the series. My son and I are going back to read the first two since we started with book 3.