Chandra Grey had walked through life believing that she was ordinary, until a chance meeting with a man calling himself a summoner opened her eyes to another world of possibilities. The summoner's life is one of secrecy, danger, and eternal conflict. Though powerful, the summoners have been forced into hiding; pursued tirelessly for millennia by the group calling themselves hunters, those sworn to destroy the Order of summoners and the demons they command. The allure of the summoner's power cannot be resisted, and Chandra finds herself drawn into the conflict, discovering along the way that her twin sister has been recruited by the very organization that seeks to destroy her: the hunters.