At some point in ancient China, an illegitimate daughter of a prince and a celestial goddess is born, named Hlynn. While not knowing her real parents at all, she soon finds her life's purpose when joining her biological father's empire, the Northern Empire. Everything is overwhelming to her as she finds out who she really is, especially since she is a demi-god, has a half- sister, and a talking cat. Hlynn must help her father overthrow the Southern Empire, the Northern Empire's enemy for centuries. But that isn't the only issue. The Japanese have come to see about the Silk Road and they want gunpowder. The only way the Northern Empire can win is if they join forces, but is that possible or even so, will something unexpected happen?
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.