The 7 and 10 others travel back in time to read the Pjo and HoO books because the fates and Primordials are having trouble with the mist. And they hope that things will be better and different when they return to their time they also hope that they become better parents and understand their kids more. Come in read the reactions of them reading about their past and future. N/A I don't own any characters they belong to Rick Riordan also the cover I saw at my nearby library and had to take a picture of it.