Ghostwalk by Rebecca Stott

When historian Elizabeth Vogelsang is found drowned, her son Cameron Brown asks his former lover Lydia Brooke to finish Elizabeth's manuscript about Isaac Newton.  Elizabeth had been researching Newton's involvement with alchemy as well as several mysterious deaths that occurred in Cambridge during Newton's time there.  Lydia agrees to finish the manuscript and is drawn into Newton's world.  Cameron is a neuroscientist who has been targeted by animal rights activists, and this adds to the suspense of the book.  I found the book to be well written, and I enjoyed it, although some of the sections that were supposed to be Elizabeth's manuscript got a bit tedious.  Lydia was the narrator of most of the book, and she was writing it to Cameron, which was a different voice than I'm used to, but it worked.  I rate it 4 out of 5.  This is my 13th book (out of my goal of 15) for the New Author Challenge 2010.