One In A Billion by Jonathan Calendar

A Love Story Like No Other Danny McDowell is nine years old at the unexpected and magical moment when he first meets five-year-old Ariel Buchanan. The meeting starts Danny and Ariel on a twenty-year odyssey where they discover that magic can only stretch so far as they head into an unknown future that contains, not only the first inklings of love, but also tragedy, and unforeseen danger.