Wow. Mystify the Magician was fantastic! I didn't want to put it down, it was just so good!
Mystify the Magician starts off where Understand the Unknown leaves off: Christopher is being eaten by a giant. The gang has found themselves in Eire, where giants guard the coastline. After escaping the giant, they meet Etain, the daughter of the king. And for Christopher, it is love at first sight.
Eire is the most civilized land in Ever World. Etain's father rules Merlinshire, which has electricity and even a street car. But during their first night, the gang is awakened: the giant they encountered is dead. Dead by gunshot. To everyone's horror, they have discovered that Senna has brought people into Ever World; people with guns.
Using her army, she besieges the castle. But when the gang manages, through the real world, to stop her from bringing a mortar into Ever World, she changes the game by bewitching Christopher into opening the gate for her army. They take over the castle and leave Christopher for dead. Luckily he encounters Merlin to help him be the hero and stop Senna. But the bad news is that no man can kill her.
Oh, and for more bad news: Loki is here. And he brought Fenrir.
This really was a fantastic read. Hands down, this was the best book of the series. But you need to read everything that came before Mystify the Magician to really appreciate it.
Only one more to go!