"The Edge of Over There" by Shawn Smucker

I think this book would have been easier to get into if I'd read the book that precedes it, The Day the Angels Fell.  But I haven't.  And I didn't have time to go find and read that one first because I was reading this for the INSPY awards and I was on a deadline.  So the first hundred and fifty pages felt like I'd never seen Buffy the Vampire Slayer before, and somebody grabbed a random disc from season 5 of the show and made me watch it by myself, with no friends or inte...