Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A good beginner's compendium

Sugden's COMPLETE HISTORY OF JACK THE RIPPER should be the first book anyone interested in the Ripper murders should read ... and this excellent collection should be the second. Introduces all the major suspects, not through a single author, but through the mouths of those who front the theories. In short: the way it should be done!