As we said, nobody is who he or she seems to be. So it's good that not all demons are bad, because almost everyone in this book, even Nick, seems to be some sort of demon.

A key conflict in the book is one that Nick isn't entirely aware of. It seems that if he lets his anger and vengeance control him, then he will become a Malachai, which is this book's equivalent of going to the Dark Side with Darth Vader. Ambrose, who is Nick from the future, is trying to guide Nick away from this violent path.

In war situations, even if the war in question is against a gaggle of zombies, brothers in arms become the best of friends. What is it about a tense situation like this that makes people bond more quickly than they would otherwise?

This is a flimsy excuse from some of the popular kids about why they've been cruel to Nick. While they won't be his enemies now that Nick knows their secret, we can't imagine they'll all be friends, either.

This should be a clue to Nick that Ambrose is really his future self. Who else would have Nick's mom as his number one priority other than Nick himself?