To purge the anger from an ancient Welsh demonic god that he had helped release, and to soothe a moody, troubled soldier, Gwyn Griffiths draws on the strength of his namesake and ancestor in Welsh magic, Gwydion Gwyn.

Young magician Gwyn and his friend Nia call upon the Snow Spider for help in unraveling the mystery surrounding Emlyn Llewelyn, an odd boy who claims his mother lives on the moon.

As a senior in high school Quentin Coldwater became preoccupied with a series of fantasy novels he read as a child, set in a magical land called Fillory. After graduating from college and being admitted into a highly exclusive, secret society of magic in upstate New York, he makes a stunning discovery: Fillory is real. But the land of Quentin's fantasies turns out to be much darker and more dangerous than he could have imagined for his childhood dream...

"Quentin Coldwater has been cast out of Fillory, the secret magical land of his childhood dreams. With nothing left to lose he returns to where his story began, the Brakebills Preparatory College of Magic. But he can't hide from his past, and it's not long before it comes looking for him. Along with Plum, a brilliant young undergraduate with a dark secret of her own, Quentin sets out on a crooked path through a magical demimonde of gray magic and...