A bloody war between humans and mermaids has stained The Crimson Empires for 10 years, hundreds of thousands dead or injured, with an end no where in sight. Marina was only a child when her mermaid clan was killed off before her very eyes, sparking the beginning of the Land and Sea war. For 10 years, she lived own her own, learning how to fight and fend for herself. Her own sorrow and hatred growing inside of her, leaving her a shell of her old self. By fate, she meets a group of young humans and mermaids that wish to end the war, knowing that it is only leading to more death. Discovering more about herself and her magic as she fights against the powers of the land and sea.
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.