The Giant war is over and Percy Jackson is spent. Finally there's a chance he can be with Annabeth for a while and he eagerly awaits the summer they have planned together. But when Hecate shows up and sends Percy on a new quest, it could be the by far stupidest thing he has ever done. He must be the new teacher at Hogwarts. Harry Potter has been attacked by the Ministry and Dementors. If that wasn't enough he now has a new teacher. But he is like, a 17 year-old kid. Who looks a lot like him. It's Harry's 5th year and he is now a nutter to the wizarding world. So when he sees the kid show up at Number 12 Grimmauld Place, he starts thinking he might actually be mental. The new kid turns out to be a teacher. The teacher of DADA. But Umbridge is still there- as the High Inquisitor. It seems she watches the new teacher-Professor Jackson- a lot more than the others. Something is off about him. And the Golden Trio always tries to find out what.

After the giant war, Percy Jackson's sanity was completly broken.Jason is gone. Piper is gone. Leo is gone. Frank is gone. Hazel is gone. Annabeth is dead. They all left Percy but at what cost? At the cost of Gaia's defeat. When Nick Fury thinks that Earth is threatened by Percy Jackson, Fury sends the Avengers to retrieve him. What will Percy do? Join him or fight? Will Percy be able to cope with his flashbacks?