Frostfire by Elly MacKay
On a walk through a snow-covered garden, big sister Miriam claims to hear the sound of a snow dragon. Little sister Celeste has lots of questions: snow dragons are real? Where do they hide? What do they eat? And is that frost on the greenhouse windows or is it . . . frostfire?
Miriam seems to have an answer for everything about snow dragons. But when Celeste wanders off, she has a magical encounter that changes everything she thought she knew.