A follow-up to the best-selling A Discovery of Witches finds Oxford scholar and reluctant witch Diana Bishop and vampire geneticist Matthew Clairmont in Elizabethan London, where Diana seeks a magical tutor and Matthew confronts elements from his past at the same time the mystery of Ashmole 782 deepens.

'A Discovery of Witches' introduced Diana Bishop, Oxford scholar and relucatant witch, and vampire geneticist Matthre Clairmont, two otherworldly beings who found themselves at the center of a battle over a lost, enchanted manuscript known as Ashmole 782. Drawn to each other despite long-standing taboos, and in pursuit of Diana's spellbound powers, the two now embark on a timewalking journey. Book two of the All Souls trilogy plunges Diana and Matthew into Elizabethan London, a world of spies and subterfuge, and a coterie of Matthew's old friends, the mysterious School of Night. The mission is to locate a witch to tutor Diana and to find traces of Ashmole 782, but as the net of Matthew's past tightens around them they embark on a very different journey, one that takes them into the heart of the fifteen-hundred-year-old vampire's shadowed history and secrets. For Matthew Clairmont, time travel is no simple matter; nor is Diana's search for the key to understanding her legacy.