"With his sister stuck in Minecraft, Gameknight999 will have to face a new enemy to save her!"--Back cover.

Gameknight999 is hot on the trail of Entity303, who has kidnapped Weaver. He follows the mysterious villain into the strange mod world of Mystcraft, with green skies, trees with blue leaves, floating islands, and a blood-red moon. Entity303 makes his way to a tower made of sparkling blue crystals, where he steals a linked book from the User-that-is-not-a-user, disappearing into one of Mystcraft's many ages. Without the linked book, Gameknight has...

"Gameknight999's true enemy has finally surfaced: Herobrine, an artificially intelligent virus that wants to escape Minecraft and destroy mankind with their own creation--the Internet. If he is able to escape the game and get online, Herobrine will infect millions of computer systems and turn machines and weapons on their masters, threatening all of humanity. After facing Herobrine in battle and nearly dying, Gameknight realizes he's going to need...