Ooooh Jack the Ripper is always a fun one. There are just so many theorized suspects that you really do have to get into their heads to try and put together the most likely suspect.
I can’t say that I’ve had a chance to sit down and read Patricia’s book on in, but it’s on my list of books to pick up. It’s about the only thing I miss about working in a bookstore; I don’t have daily access to the true crime section anymore.