From the author of the USA Today bestselling Priest and New Camelot series comes the fourth and final book in a high-heat, gothic, dark academia fairy tale full of lantern-lit rituals, foggy moors, and obsessions that last for a lifetime.

Twelve years ago, their fates were sealed with a kiss.

They are all, for better or worse, doomed to love each other until death do them part. Auden Guest's heart belongs to Proserpina and St. Sebastian - even if he no longer wants it. Even if she has left it behind to follow him.

Delphine has fled back home, and Becket's holy calling is in peril.

And now only Rebecca and Auden remain at Thornchapel to face the unknown.

The door is open. The door that shouldn't exist; the door that people have died to close. Auden doesn't feel like the lord of the manor. He doesn't feel like a king or a wild god. He is a friend and a boyfriend and a brother - and a failure at being all of these things. But the door doesn't care about his guilt. It only cares about the sacrifice he'll make to close it.

As the bruising dark of Samhain approaches, so does the fate of their circle, of Thornchapel and the village and the valley beyond it. And Auden must don the crown, because one thing is still true, even if he must face it alone.

Here at Thornchapel, the kings must go to the door.

Here at Thornchapel, all kings must die.