Sereia Vale is no one special — a girl from the quiet village of Briar Hollow who braves a cursed forest in the dead of night to find medicine for her feverish sister. But when the world turns to obsidian and the path home vanishes, she stumbles across something no human is meant to find: the Boundary.

On the other side lies Nytherra — a shadow realm of ancient courts, corrupted souls, and a king who rules through fear. Here, human hearts are devoured on contact. But when the darkness reaches Sereia… it recoils. She is an anomaly. An impossibility. A problem.

And Zayren — the Night Heir, prince of obsidian armor and silver eyes — does not leave problems unsolved. He claims her. Marks her wrists with shadow-bonds to keep the darkness from consuming her. Brings her to his fortress as his prisoner. His anomaly.

Sereia has one goal: get home. Zayren has one order: find out why she survived. But in the cold corridors of the Night Court, between dangerous truths about her own blood and a forced marriage that makes her the key to tearing open ancient gates between worlds, something more treacherous than shadows begins to grow between captor and captive.

Because the Night King wants to use Sereia as a living bridge to open the dark gates sealed after the soul wars. And the only thing standing between her and the end of both worlds is a prince who was never supposed to care — and a girl who was never supposed to matter.

"Whatever you do, do it because it's yours."