User blog comment:Menara/The Son of Sobek: The official PJ and Kane Chronicles Crossover/@comment-10487081-20130508022521/@comment-71.91.91.58-20130508032226

Ok, that does make sense. I think most of the evidence points to this being after HoO, though it's possible I'm being biased since I kinda just want proof that everything ends all right after HoH.

I've also been hearing a lot of people say this happened before Percabeth fell, and Percy will call Carter to help him in Tartarus, which isn't that likely, I think.

They agreed he would call only if the threat concerned them both, and it would be kind of a jerk move to get someone you barely know involved in such a difficult situation, especially since Carter really isn't any better equipped than Percy to deal with things in Tartarus.

If Percy really wanted someone to help him in Tartarus, it would have made more sense to get Nico or one of the others to jump down with him, especially since Nico's already survived it once.

Calling on someone else to help him in Tartarus would only work if Percy was really selfish and didn't mind putting his friends in danger, so I don't think it's going to happen.