The Goblet of Fire was my favorite of the Harry Potter books for a long time and this reread - the first in over 8 years reminded me why I loved this plot so much. To me, this is where we stop being a middle-grade story and we have Harry and the gang thrown into serious adult themes. This marks the first book where we have major deaths until the end. It is sad, it is heartbreaking and it gets serious. 
 I love everything about this book - I love World Quiddich Cup, I love the Triwizard Tournament, I love the other schools, I love the Yule Ball, I love Ron/Hermione's row, I LOVE LOVE LOVE Moody (he's one of my top 3 characters of the series) and I had forgotten how much I hated Rita Skeeter. In short, this was so enjoyable that I become completely emerged in the world like I have before. 
 If you've read these books in the past and it's been a few years - check them out in audio format. If you've never read them, I highly suggest you plow through the first 2 which are clearly children's book and go into the more mature content, you will enjoy yourself, I promise.