Heaven condemns Mara as a soul-devouring demon and imprisons her in the Mourning Vault for three hundred years. Six-winged judgment angel Sera arrives to execute her, only to discover that Mara has been restoring the souls Heaven discarded. They fall in love. When Sera returns to Heaven to clear Mara's name, Crown Prince Adrian and Chief Prosecutor Helena mutilate and kill her, then use her face, halo, and wings to create an impostor. Mara breaks her last chain, storms the palace, and calls Sera back as a vengeance spirit. But when vengeance ends, Sera's grace shatters into seven fragments. Mara begins a ninety-nine-day quest, losing one-seventh of her infernal power with every piece she recovers. At the Restoration Rite, she uses her own heart sigil as Sera's living soul anchor and defies Heaven's Nine Judgments. Both women lose immortality—and finally gain the freedom to love each other beneath the sun.
