When the moon rises, Princess Belle Du Bois is no longer a princess. At night, she steals away to her workshop hidden in the castle’s dudgeon. She is a mechanic − A ticking pocket watch at her hip, the warmth of a lamp glowing between her fingers, the hiss of hot metal in water. These are her true loves. Her talents are a secret to everyone, except perhaps the legendary Beast that is said to stalk the dungeons below the West Wing.
Belle’s brother, the soon-to-be king, is kidnapped, and the only way to save him is to invent a mechanism even more powerful than magic. With the help of the enigmatic Captain Adam Girouard and a team of Delusionists, addicts of a tiny, scarlet flower— a drug called Delusion — who stalk the catacombs that run like veins beneath the city, Belle leads a team to bring her brother back. As Belle and Adam draw closer, they learn that the strength of love can tame a beast and shape a princess into a hero.
In the epic conclusion to the Devil's Deal series, Freya has one final chance to discover the full potential of her own power, and to use it to restore balance in the universe - once and for all. After the destruction caused by Roisin, Ferya and Torix come to terms with their losses and mistakes... And prepare for a final battle that will change everything.