Swords and Wands

The demigods from the Prophecy of Seven and a few others are given a quest once again! After getting Leo back from the dead and defeating Gaia, the gods provide them another quest.
They are sent to Hogwarts School of Witchcraft and Wizardry, where they will go undercover to protect a wizard named Harry Potter. Their main challenge? To keep their demigod identity a secret from the wizards while keeping Harry safe. Are our heroes up to the challenges?
Join the demigods of Olympus as they journey into the world of wizards, magic, and wands.

After Heroes of Olympus: Blood of Olympus and Harry Potter and the Deathly Hallows
Spoilers ahead!

Characters belong to Rick Riordan and JK Rowling
If there is another story with the same title, I did not mean to copy it.