Ten years have passed, but neither Primrose nor her sisters, Poppy and Posy, can shake the belladonna-soaked trauma of their childhood. Though the triplets have grown and are no longer captive, the memory of Black Annis's iron talons and needle teeth still linger.

While Posy finds reprieve in studying with the Elder Mother and Poppy drowns her mental wounds in song and service, Primrose copes by traveling wherever the wind takes her. Much like her beloved half-brother Rush used to, she finds solace in seeking new havens. However, news of Sparrow's dying mother draws Primrose home again, and she resolves to stay in the glade to spend one last Christmastide with the only woman she's ever called mother.

That is until a shadowy Pooka appears with a message tangled in Fate's red thread: a prophecy from the fabled Numina that threatens to upend the family all over again.

With only the suspicious, dark Pooka as their guide, the triplets must follow the Numina's destined trail to a perilous mountain haunted by trickster spirits. But when their dubious quest delivers them into the claws of the infamous witch Baba Yaga, the goblin sisters are forced to face their childhood nightmares or let the world, and those they love, be forever consumed by darkness.