User blog comment:Menara/The Son of Sobek: The official PJ and Kane Chronicles Crossover/@comment-5593616-20130602175337

Now all Percy has to do is say "Carter" for Carter to know he needs help, and we are assuming that Son of Sobek takes place after Heroes of Olympus. That therefore means that RR is planning another crossover, otherwise what would be the point of Percy being able to contact Carter?