The Holy Grail of Eris

Among ambitious nobles, deceit and coercion are everyday tools—but House Grail stands apart, priding itself on honesty and upright conduct. Constance Grail, the family’s youngest daughter, lives by those ideals, determined to do what’s right and lend a hand wherever she can.

That steadfast morality offers little protection when her fiancé betrays her and his new lover engineers a scandal to ruin her. With no one willing to hear her out, Constance is saved by an unlikely ally: the spirit of Scarlett Castiel, a notorious woman who can possess her and swiftly turns the accusation back on its source—though the intervention comes with strings attached.

A decade earlier, Scarlett was executed for allegedly attempting to poison Princess Cecilia, a crime she insists was fabricated. Unable to uncover who framed her, Scarlett presses Constance—the only person who can see her—to help uncover the truth and take revenge on everyone responsible for her downfall.