On Kupala Night, Dymitr arrives in Chicago’s monstrous, magical underworld with a perilous mission: pick the mythical fern flower and offer it to a cursed creature in exchange for help finding the legendary witch Baba Jaga.

Ala is a fear-eating zmora afflicted with a bloodline curse that’s slowly killing her. She's just desperate enough to say yes to Dymitr, even if she doesn’t know his motives.

Over the course of one night, Ala and Dymitr risk life and limb in search of Baba Jaga, and begin to build a tentative friendship. . . but when Ala finds out what Dymitr is hiding, it could destroy them both.