Summoner #3: The Final Showdown

After their last battle with the summoners, Pelle, Julie, and Villads decided never to play anything ever again. Not even Parcheesi or tic-tac-toe.
With the exception of computer games, of course. Because the summoners don’t play computer games. Or do they?
Will Pelle, Julie, and Villads be safe if they stick to computer games?
Can they … of course they won’t be safe! If they were safe, the story would have ended in book 2, right? And you wouldn’t be reading book 3 now, would you?
The summoners launch another attack. It’s gonna be wild, it’s gonna be epic. In fact, this may be the best book you’ve ever read!
Relax, I said maybe, didn’t I? And you do have to read something, don’t you? Otherwise your teacher’s just gonna force you to read something really lame about the biodiversity in the reproduction cycle of organic potatoes, and come on - do you really wanna do that?