User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-24.140.54.85-20121007012833

OMG!!!! Just finished the book! My prediction for House of Hades:

Annabeth and Percy travel through Tartarus, going nearly insane, and close the doors, while Jason, Leo, Piper, Frank, Hazel and Nico close it through Erapis. (It they close the doors, how will Annabeth and Percy get out?)

Big fight happens, Porphryion captures Nico, kills him (I hope not though), and wakes Gaea with his blood. Annabeth and Percy return, and Porphyrion is defeated with the help of a god.

The Seven go to Olympus, meet the schizophrenic gods, and convince them to help. Romans attack Camp Half-Blood, the Seven arrive, stop the fighting. Camps make peace, and prepare to fight Gaea.

Book 5 Title: The Battle of Time