House of Hades by Rick Riordan
It's the continuing middle grade story of demi-gods (half-gods, half-human) in our world, and in this book,
Annabeth and Percy tumble into a pit leading straight to the Underworld. The other five demigods have to put aside their grief and follow Percy’s instructions to find the mortal side of the Doors of Death. If they can fight their way through the Gaea’s forces, and Percy and Annabeth can survive the House of Hades, then the Seven will be able to seal the Doors both sides and prevent the giants from raising Gaea. But, Leo wonders, if the Doors are sealed, how will Percy and Annabeth be able to escape?
They have no choice. If the demigods don’t succeed, Gaea’s armies will never die. They have no time. In about a month, the Romans will march on Camp Half-Blood. The stakes are higher than ever in this adventure that dives into the depths of Tartarus.
And on page 292 - a character comes out as gay! (And the reaction they get is pretty awesome.)
My thanks to Yapha, That One Geek Girl, Jacob, and all the other faithful blog readers who let me know with so much enthusiasm and excitement about the gay character coming out in this best-selling series!
It's the fourth book in the Heroes of Olympus series, which is after the five books in the Percy Jackson and the Olympians series (so it's kind of the 9th book.) Add your review of "House of Hades" in comments!