User blog comment:Menara/The Son of Sobek: The official PJ and Kane Chronicles Crossover/@comment-153.107.97.168-20130430235621

It's can't be written during the time Percy was finding his way to Camp Jupiter, because he asks Carter if he was a son of Ares. At the end of The Serpent's Shadow, Sadie said they had detected foreign magic along Long Island. This means that they fought Apophis before The Battle of the Labyrinth, meaning that Percy and Carter meet after The Last Olympian. That's what I think anyway