User blog comment:Frodo the 9 fingered/A Third Camp?/@comment-5052683-20120728235141

i read the first chapter to mark of athena. Annabeth is more likely to be the seventh. In all the other books RR states how they start heading for a quest and if they stop they do what they have to do and continue you on with the as in Battle of the Labyrinth. They headed back for the quest stop, talk to percy's mom and got rachel then continued.