Adult fantasy today. From the description:
"In this tale of passion and obsession, Diana Bishop, a young scholar and the 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 navigates with her leading man, vampire geneticist Matthew Clairmont. Harkness has created a universe to rival those of Anne Rice, Diana Gabaldon, and Elizabeth Kostova, and she adds a scholar's depth to this riveting story of magic and suspense."
Although this was one the "Best books of the Month" for February 2011, this only recieved 3.7 stars based on 1389 reviews with 221 one star and 161 two star dissenters. Regular price is $9.99, so only 70% off today. 594 pages.