It's been a thousand years since the fae came out of hiding and locked the doors to the demon realm. A thousand years of pulling humanity back from the brink... But the doors are not without their cracks. Merlin knows this better than anyone. He's seen what can happen when a demon gets free, and he's determined to stop it from ever happening again. But when he's dragged into a fae investigation, he's thrown into the midst of a battle for the heart of the city... and a truth that is far darker than he ever dreamed.