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When sixteen-year-old Lady Victoria is discovered to have magic powers, she is banished to a reform school where she falls in with rebellious students who have pledged to protect England from conquest.

When three cousins in 1814 London discover their magical powers and family lineage of witchcraft, they accidentally open the gates to the underworld, allowing the spirits of dark witches known as the Greymalkin Sisters to hunt and kill young debutante witches for their powers.