A Discovery of Witches first to get what is going on). As a tale about witches and vampires, there isn't a lot of action or back story on the whole witch/vampire/daemon culture. But this book was full of day to day details of life in 16th century Europe, which was a surprising highlight for me.
Shadow begins where Discovery left off, with Diana Bishop and Matthew Clairmont having time walked back to Elizabethan London. In search of the elusive manuscript, Ashmole 782, Diana is also hoping to hone her skills as a witch before they return to the 21st century.
We learn a lot about Matthew's past and his varied connections throughout Europe which include Queen Elizabeth and the emperor of the Roman Empire (or something like that). We also gain insight into Diana's unique skills, although I really wasn't visualizing the string metaphors Harkness used to help us explain them. We also get many examples of how Diana and Matthew are hopelessly devoted and bonded to each other. The latter involving the ever romantic rituals of bloodsucking and kissing third eyes.
It seemed the search for Ashmole and Diana's training were just vehicles for Harkness to explain what Diana and Matthew wore and ate from day to day, "Diana! Where are my hose!?" Matthew's many ties took them from country to country, meeting new characters that I couldn't keep track of and getting involved in tangentially related hijinks, the details of which I couldn't relate. But I certainly remember their accommodations and the social customs of each location.
At the end of the book, I felt the plot furtherance didn't match the geographical and chronological grandeur Diana and Matthew experienced. I'm worried that the third book will be another slow-moving read, especially without the historical interest the second held over me.