In this tale of passion and obsession, Diana Bishop, a young scholar and a descendant of witches, discovers a long-lost and enchanted alchemical manuscript, Ashmole 782, deep in Oxford's Bodleian Library. Its reappearance summons a fantastical underworld, which she navigates with her leading man, vampire geneticist Matthew Clairmont.

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

Diana and Matthew time-travel back from Elizabethan London to make a dramatic return to the present?facing new crises and old enemies. At Matthew's ancestral home, Sept-Tours, they reunite with the beloved cast of characters from A Discovery of Witches?with one significant exception. But the real threat to their future has yet to be revealed, and when it is, the search for Ashmole 782 and its missing pages takes on even more urgency.

On the battlefields of the American Revolution, Matthew de Clermont meets Marcus MacNeil, a young surgeon from Massachusetts, during a moment of political awakening when it seems that the world is on the brink of a brighter future. When Matthew offers him a chance at immortality and a new life free from the restraints of his puritanical upbringing, Marcus seizes the opportunity to become a vampire. But his transformation is not an easy one and the ancient traditions and responsibilities of the de Clermont family clash with Marcus's deeply held beliefs in liberty, equality, and brotherhood.

Fast-forward to contemporary Paris, where Phoebe Taylor--the young employee at Sotheby's whom Marcus has fallen for--is about to embark on her own journey to immortality. Though the modernized version of the process at first seems uncomplicated, the couple discovers that the challenges facing a human who wishes to be a vampire are no less formidable than they were in the eighteenth century. The shadows that Marcus believed he'd escaped centuries ago may return to haunt them both--forever. A passionate love story and a fascinating exploration of the power of tradition and the possibilities not just for change but for revolution, Time's Convert channels the supernatural world-building and slow-burning romance that made the All Souls Trilogy instant bestsellers to illuminate a new and vital moment in history, and a love affair that will bridge centuries.