The Magician King (The Tie-In)

Quentin Coldwater should be happy. He escaped a miserable Brooklyn childhood, matriculated at a secret college for magic, and graduated to discover that Fillory a fictional utopia was actually real. But even as a Fillorian king, Quentin finds little peace. His old restlessness returns, and he longs for the thrills a heroic quest can bring. 

Accompanied by his oldest friend, Julia, Quentin sets off only to somehow wind up back in the real world and not in Fillory, as they d hoped. As the pair struggle to find their way back to their lost kingdom, Quentin is forced to rely on Julia s illicitly learned sorcery as they face a sinister threat in a world very far from the beloved fantasy novels of their youth."