I think that a lot of people have read the Heroes of Olympus, and Kane Chronicles crossovers right?

In the first book, Percy and Carter meet and defeat the crocodile.

In the second book, Annabeth and Sadie meet and find the staff and stuff.

I have a theory for the third book.

In BoO, when Leo, Hazel, and Frank are on Delos, where Apollo and Artemis are born, Apollo mentions the Oracle.

He says he can't step off the island to help the Oracle. Rachel has lost her prophecy powers too. He says his enemy, the Serpent (or was it a Python?) is in the underground caverns where the Oracle is and is blocking the power.

Well Egyptians are usually around snakes right? So I think Percabeth and the Kanes are going to go to free the Oracle but I'm not sure. It's just a theory.

Yours in demigodishness, and all that. Peace out.