This is the third installment of the "All Souls Trilogy."  It came out July 15th.  I read it in about a week.  I recommend you read all three, starting with "A Discovery of Witches."   It's a great story about a witch and vampire who fall in love and battle others of their kind because witches and vampires aren't supposed to mix. The second book, "Shadow of Night" takes a trip back in time to London in 1590.  I has Sir Walter Raleigh and Queen Elizabeth, among others.  I picked up the first book in the "new authors" section of Barnes & Noble one day.  What a find.