God didn't settle somewhere in a shelf of Heaven, or in the Carribean, nor in barren deserts, or moist wastelands. He didn't hide with a woman, or an angel, he hid with the gods and monsters. God hid in perdition, where he could not be found. "Well motherfucker, looks like we need to have a talk about Where's Waldo," growled Gabriel.
In a world that Castiel doesn't know, one with Wendigoes, monsters, and even demons, he has no way out. But why does everyone seem to think he's the price of some castle he's never even heard of, and who is the trickster? Castiel learns very fast that this world has rules, and learning to play by them is the only way to survive.
Castiel is a dangerous witch known for his monstrosity, for stealing the souls of the innocent. Dean Winchester is the prince of the castle and while he doesn't want to go to the dangerous witch, it's his last chance to save Sam. He'd do anything to save Sam, even when Castiel demands Dean's own soul in payment.