Instruct: Classify a given review as either positive or negative.
Query: not even an interesting theory

I was really looking forward to reading Portrait of a Killer, I've been interested in Jack the Ripper since a trip to England and read some other works about him, mostly just this-is-what-happened casebooks. But this book was awful. The author blatently states that "Ripperology" is just something she picked up one day and decided to write a book on, and she didn't seem to to a very good job getting her research on the cases and the theory she has. After reading the speculations of Ripperologists, much more creative, I found her speculations boring, and it was the same old thing over and over again for pages, just "look at the watermarks! Look at his pictures!" This was the only real evidence the author had. This book was very boring. If you want a good read on Jack the Ripper try Donald Rumbelow's The Complete Jack the Ripper, it's a much better read and better written as well. Save your money on this one.