I just finished this one yesterday, and let me me tell you... I loved every single minute of it. It was strange and weird and unique and a little bit crazy, and for me it was absolutely perfect! Grady Hendrix, you have a new fan! 
 Abby and Gretchen are best friends. They have been since Abby's birthday party in fifth grade when Gretchen was the only one to show up. Since that day, they have become inseparable. Years later, Abby, Gretchen and their other two friends, Margaret and Glee decide that they want to use LSD, just to see what happens. Hours later, after a skinny-dipping gone wrong, Gretchen goes missing, Abby searches all night long, but they don't find her until the next morning. Gretchen isn't at all herself, but Abby thinks she just needs to sleep. Little does she know, things are getting ready to change in ways she could never have guessed. 
 The relationship between Abby and Gretchen is one of the best things I have read in YA fiction to date. The love these two girls share is something that can't be shattered, not matter the tests thrown their way. And there are some huge tests. Gretchen turns into an horrible person, and yet Abby never once gives up on her. And Gretchen doesn't stop believing that Abby can save her. This depiction of friendship, of such an unbreakable bond, made this book a top-notch read. 
 Pacing, plot, characters, world-building, writing, characterization... all of the things that get mixed together to make a story, were all done to almost-perfection in My Best Friend's Exorcism. The 80's setting was incredibly nostalgic! And the creepy was downright creepy, just maybe not in the way I was expecting. 
 I adore this book, y'all! So much. I really hope that you will give it a shot.