The Unspeller and the Book of Days, by Eileen Sharp

The Unspeller is a fantasy set against the ticking clock of magic’s end. Aesa Jereward finds himself the center of suspicion and fear when he is the only child born without the gift of magic. Being part of a rich bloodline with deep magic only increases his misery. One day Aesa meets a beautiful girl from a forbidden race. His curiosity about her leads him to a danger that reveals more than he bargained for. Is he really cursed to live without magic, or is there a bigger nightmare for him? With the help of his extraordinary siblings and a dragon of mysterious origins, Aesa must find his own path in the destiny of magic.