Set after Percabeth comes back from Tartarus, Leo made a machine that closed the doors. ( I didn't read HoH jet, so no spoilers, please)
Big Three kids appear in Goode Highschool and must read the books. Beginns with the Titans Curse (because the storys with the Lightning thief are starting to annoy me)
There is a course and a bit drama
and later Percabeth, Jasper, Tratie, maybe Thalico and Clarisse/Chris
Gods will apear maybe there will be fights and flashbacks.