Camp Half-Pure

When Aleka Kalivas learns that she has an endowment her parents quickly brush up on their family history and sare alarmed that the endowment part of the family skipped 4 generations from Aleka's great great grandfather! He was send to a camp called Camp Half-Pure where they keep the endowed kids away from danger and teach them how to control their powers.

Most words, places and story structures give rights to Jenny Nimmo and Rick Riordan