Kaelith, a feyborn marked by silver runes and black wings, seeks vengeance after the Fey Council slaughters her mother. Fleeing to the Unseen Glade, she trains under the scarred warrior Syris, her magic amplified by a dangerous blood oath that binds her to a shadowy entity. As Kaelith infiltrates the Fey Realm to confront her father, Lord Veyl-a Council member who engineered her birth as a weapon-betrayals and her own unraveling sanity threaten to consume her. In a storm of thorns and shadow, she brings down the Council, but at a cost: her humanity, now a fragile thread in her new, darker path.