I enjoyed this one, though I predicted the way it would end. The story goes back and forth between centuries, between the 2 major characters. An orphaned girl is asked by Ben Franklin to help him with his newest invention, the glass harmonica, after he hears her playing the musical glasses on a street corner in London. In the 21st century, a young woman is a musical prodigy skilled at playing the glass harmonica, but is haunted by ghostly visions. I loved all the musical & historical references throughout the book.