In a world with only two seasons—Day and Night—light is all that separates the living from the cursed. For when Night falls, the Locura plague the land … Corwin Medisto is turning 16 and becoming a man, but that’s the furthest thing from his mind. He and his twin sister Taylee have discovered an ancient relic fueled by dark magic that has a mysterious link to their long-dead mother. Worse yet, they’ve accidentally activated it. Desperate to learn the truth of its origins and to break free of its curse, the twins leave home with their childhood friend Tray’o and embark on a quest that leads them to come face to face with Syyris Sagrado, the god of Day, and to discover a forbidden power greater than the forces of Day … and Night.