The Trojan Horse Traitor (Levi mode Prince) by Blake, Amy C. NEUF

Left on Castle Island by his parents to attend Camp Classic, Levi Prince finds himself at the center of an enchanted world of amazing abilities, cloudy motives, and wicked beings that will challenge his very spirit. He begins to form friendships, but life at camp becomes more confusing as questionable activities and uncertain agendas bring about conflict that tests his character in ways he never expected. Finally, faced with a friends betrayal, Levi is forced to confront true evil. Will he find the courage to stand his ground, and to become the hero he was always meant to be?