Alright guys, I finished the book at around 12:06 last night. I was going to put it down at 11:00, then realized that I only had 100 pages left, so I was like: Pssh, sleep? That's for the weak! and finished it. I thought that many of the characters that people had formerly disregarded, (Jason, Piper, etc.), made great comebacks, and proved that they are not characters that should be undermined, and I was very happy about this, because to me, Jason is not an anti-Percy, and Piper is not an anti-Annabeth. They are their own individual people, and they can make their mark in battles. Nico and Renya DO have their own POV's in the book, and Rick did a great job of incorporating their thoughts as if they were part of the Seven all along. The last few hundred pages, are, of course, the best, but the very last pages, around 50 or so, have one of the greatest plot twists ever, and Rick carefully balances fan's emotions with writing something that we all knew would come. With a compelling beginning and middle, and a heart-wrenching ending, (I was crying), you won't be able to put the book down. Highly recommend for fourth grade and up!