It was dark. Impenetrable. Impossible. It was black incarnate. This thing I had created? It was a monstrosity. And I couldn't stop it.
Ava Woods is the youngest of six girls; her father's already married off each of her sisters to influential men and women, and now it's Ava's turn. When the crown prince is rumored to be visiting Greenoak Fortress where her elder sister Vivian lives, her father packs her up and sends her off immediately. However, things are not as they seem in Greenoak. Servants are going missing, Vivian is reserved but Ava can tell something is worrying her. And then there's the Prince. He stalks the halls at night with a cruel smile on his lips and dead, unseeing eyes. Ava knows things are about to become deadly, and she will have to find a way to stop it
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.