Deep underground, 39 women live imprisoned in a cage. Watched over by guards, the women have no memory of how they got there, no notion of time, and only a vague recollection of their lives before. As the burn of electric light merges day into night and numberless years pass, a young girl—the 40th prisoner—sits alone and outcast in the corner. Soon she will show herself to be the key to the others’ escape and survival in the strange world that awaits them above ground.

The Yaga siblings—Bellatine, a young woodworker, and Isaac, a wayfaring street performer and con artist—have been estranged since childhood, separated both by resentment and by wide miles of American highway. But when they learn that they are to receive an inheritance, the siblings agree to meet—only to discover that their bequest isn’t land or money, but something far stranger: a sentient house on chicken legs.

Olivia Prior has grown up in Merilance School for Girls, and all she has of her past is her mother’s journal—which seems to unravel into madness. Then, a letter invites Olivia to come home to Gallant. Yet when Olivia arrives, no one is expecting her. But Olivia is not about to leave the first place that feels like home; it doesn’t matter if her cousin Matthew is hostile, or if she sees half-formed ghouls haunting the hallways.

Psyche, princess of Myce­nae, was born with a prophecy that she will one day conquer a great monster. Rejecting her royal duties, Psyche spends her youth mastering blade and bow, preparing for her destiny. Tales of her beauty and rebellious nature reach even the goddess Aphrodite, who decides to teach Psyche a lesson. Aphro­dite commands Eros, the god of desire, to deliver a cruel love curse. After eons watching humanity misuse his gifts, the last thing Eros wants is to become involved in the chaos of the mortal world.

Linus Baker is a by-the-book case worker in the Department in Charge of Magical Youth. He's tasked with determining whether six dangerous magical children are likely to bring about the end of the world. Arthur Parnassus is the master of the orphanage. He would do anything to keep the children safe, even if it means the world will burn. And his secrets will come to light.