User blog comment:Menara/The Son of Sobek: The official PJ and Kane Chronicles Crossover/@comment-5885060-20130511082742/@comment-60.230.200.223-20130512054429

Actually if no-one remembers, Nico talks about the doors of death and a key to closing them (pg 111) in the Demigod Diaries in the story: The Sword of Hades, check it out. This book was released to be between the Battle of the Labyrinth and the Last Olympian so this means that the Son of Sobek should in fact be set just before Percy is kidnapped by Hera (the evil witch).