A Harry Potter x Percy Jackson Fan Fiction. Hermione Granger spots a mysterious girl.

The Seven, Nico, Will, and Calypso go to Hogwarts. It starts as Percy and Annabeth teaching but progresses quickly. Will they be able to stop the new threat from arriving? Note* This story is only going to be 13-20 chapters long. I find that when I read fanfiction if it doesn't progress fast I get bored, so I'll keep it short. This will be finished though, then I'll move onto a PJO and MCU crossover or something.