Isshuay series book 1: through the shimmering

Why is shy, dreamy Ali the only one who has the power to save the magical land of Isshuay? How can Bern, a boy she has only just met, convince her that she must go with him to a place she has never heard of? Who are the mystical Silver Ones who have chosen her for this special task?Alis life is about to change forever when she flies with Bern through the Shimmering into the beautiful land of Isshuay. But can she find the courage to recover the stolen Lifestone and save the land?