Young magician Gywn and his friend Nia have been warned to stay away from Emlyn Llewelyn, the strange boy who claims his mother lives in the moon. And yet, a mysterious magic continues to draw them to him. But why?
The answer lies in the Snow Spider's web, an ice-cold flower's glow, and the haunting whispers of children from someplace far away. It's up to Gwyn and Nia to solve the mystery, with the help of Arianwen, the Snow Spider.