This is the follow-up to Discovery of Witches. There’s a third one in the works, too. This book was chock-full of literary and scientific characters that are intimately involved with the two main characters, Diana and Matthew. There are also references to the Salem witches (Diana is a distant relative of the Bishops from Salem, MA). There is lots of moving around as Diana and Matthew time travel to find an ancient manuscript. It is sometimes confusing to keep it all straight, but it’s worth it to keep reading. I’m looking forward to Book 3 in this series.