Waiting on Wednesday #11

Waiting on Wednesday is hosted by Breaking the Spine.
It's a weekly meme about upcoming books we're excited about!

The House of Hades
(The Heroes of Olympus #4)
by Rick Riordan
Publication Date: October 8, 2013

From Goodreads:

At the conclusion of The Mark of Athena, 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 Gaea's forces, and Percy and Annabeth can survive the House of Hades, then the Seven will be able to seal the Doors on 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.

Emerald Green

(Ruby Red Trilogy #3)

by Kerstin Gier

Publication Date (US): October 8, 2013

From Goodreads:

Gwen has a destiny to fulfill, but no one will tell her what it is. She's only recently learned that she is the Ruby, the final member of the time-traveling Circle of Twelve, and since then nothing has been going right. She suspects the founder of the Circle, Count Saint-Germaine, is up to something nefarious, but nobody will believe her. And she's just learned that her charming time-traveling partner, Gideon, has probably been using her all along.