"I know where Lucifer is."
It's been a year since the Carousel, and John is struggling with his leadership of the house, as they continue to protect the world from the denizens of Hell and Bower's Fall. Meanwhile, Luke and Emma are attempting to rebuild their lives, until one night, Luke is kidnapped and coerced by a group of mercenaries who are determined to reach the far side of Hell, and have need of his particular skills.
Immediately, Emma and John attempt a rescue, but their lives are thrown into chaos when they discover plans have been set in motion that coincide with Luke's kidnapping. Somehow, they must find a way to reach Luke before he opens the breach to a world-threatening catastrophe.
Some gates should always remain closed.