User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-6068707-20130714151153

I also want to know, can't Percy heal Annabeth's ankle. I mean he was capable of helping her breath underwater at the end of the Last Olympian, so my thought is he could heal her ankle so that they could escape.

It would also kinda tie into the books American cover, since as we can see, all of the cover art has been spoken of in the book, the fight between Percy and Jason, Percy rising out from the ocean after plummiting down a steep drop, and also Jason, Piper and Leo all making their way out of Qubec.