Mae Evans is a rule follower who stands unrivalled when it comes to loyalty and honesty. Ophelia Shax is a teen prodigy despite her headstrong and stubborn nature, only seeming to propel her further regarding her educational skills. Samuel Zaagman is a quiet boy almost solely defined by his combat skills despite his inability to see. Raul Shimabukuro is a rule breaker and the epitome of a soul seeker, following no one but himself. These four individuals may seem to be the most different of people, yet what they have in common may surprise you. They are all on Earth for one reason, and that is to protect their Vectors, as they are four of the few guardian angels left. Though they think they will not need one another, their paths will cross once more in a way they would never wish upon even their worst enemies.
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.