Simon, Baz, Penelope, and Agatha return to England, back to the Watford School of Magicks, and back to their families for a final adventure. Simon must decide whether he still wants to be part of the World of Mages-- and if he doesn't, what does that mean for his relationship with Baz? Meanwhile Baz is bouncing between two family crises and not finding any time to talk to anyone about his newfound vampire knowledge. Penelope would love to help, but...

"Simon Snow is the worst Chosen One who's ever been chosen. That's what his roommate, Baz, says. And Baz might be evil and a vampire and a complete git, but he's probably right. Half the time, Simon can't even make his wand work, and the other half, he starts something on fire. His mentor's avoiding him, his girlfriend broke up with him, and there's a magic-eating monster running around, wearing Simon's face. Baz would be having a field day with all...