Yes! I'm pretty sure I'm the first person to give an analysis of The House of Hades! *accomplished
So, to give you some sustenance for another year's wait, I've decided to analyze the book.
First of all, what the Hades was that ending? Literally. I'm pretty sure we all silently cried as we read it. Especially since the whole thing could've been prevented.
The most disturbing thing to me is a passage earlier in the book, on page 382. Percy is having a dream, and at the very end Gaea tells him "Enjoy Tartarus, my little pawn." Did she KNOW he was going to Tartarus? Or was it just an empty statement...