"After traveling through time in Shadow of Night, the second book in Deborah Harkness's enchanting series, historian and witch Diana Bishop and vampire scientist Matthew Clairmont return to the present to face new crises and old enemies. At Matthew's ancestral home at Sept-Tours, they reunite with the 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...

Matthew and Diana return from their trip to 1590 to find tragedy has occurred at Sept-Tours. They are closer to knowing the location of the Book of Life and its missing pages, but enemies from their past and present are threatening from all sides.

Having escaped to hide in Elizabethan London, Matthew and Diana must find a powerful witch teacher to help Diana control her magic and search for the elusive Book of Life. Enemies are everywhere, the threat to witches is growing, and Diana and Matthew's romance faces a barrage of new threats, from within as much as without.