Syren is the daughter of traitors: her mother is a White Heart where as her father a Black Heart. After her parents are killed, she's been taken in by her uncle to Antarcion, the White Heart Kingdom.
Now she finds herself in the same predicament as her parents, but she didn't marry a Black Heart out of love. It was more of a political contract.
What's more, she's discovered that she harbours a power alien to her kind within her. A power only the Darkmyrs should have, the eternal enemy of her as well as her husband's people.
With the Darkmyrs after her and a husband that hates her, an unexpected ally and previously-thought enemy by her side, Syren journeys into the unknown to discover the secrets behind her power as well as the origins. She may even develop feelings of love, an emotion she vowed she would not feel after the tragic story of her parents.
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.