It begins with absence and desire. It begins with blood and fear. It begins with a discovery of witches.

Diana Bishop, a young scholar and descendant of witches, discovers a long-lost and enchanted alchemical manuscript deep in Oxford's Bodleian Library. Its reappearance summons a fantastical underworld, which she must navigate with a vampire, Matthew Clairmont.

This manuscript, Ashmole 782, holds the secrets of their past . . . and the key to their future.