Aqua Reinhold And The Coup Of Witchcraft

This Story is set in the time when Piper, Piper and Jason goes on their first quest to save Hera and prevent the king of the giants to gain control
Aqua and his friends find themselves in demigod world, but Hectate is god-napped and they need to save Hectate. What sort of foes will they meet? what kind of allies will provide protection?