With inspiration from Mary Shelley's Frankenstein, this breathless conclusion to the Madman's Daughter trilogy—perfect for fans of Libba Bray—explores the things we'll sacrifice to save those we love . . . even our own humanity.

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After killing the men who tried to steal her father's research, Juliet—along with Montgomery, Lucy, Balthazar, and a deathly ill Edward—has escaped to a remote estate on the Scottish moors. Owned by the enigmatic Elizabeth von Stein, the mansion is full of mysteries and unexplained oddities: dead bodies in the basement, secret passages, and fortune-tellers who seem to know Juliet's secrets. Though it appears to be a safe haven, Juliet fears new dangers may be present within the manor's own walls.

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Then she uncovers the truth about the manor's long history of scientific experimentation—and her own intended role in it—which forces her to determine where the line falls between right and wrong, life and death, magic and science, and promises and secrets. Juliet must decide if she'll follow her father's dark footsteps or her mother's tragic ones—or make her own.