I read Moore's Watchmen last year and was really looking forward to reading more of his work. 

Knowing very little about the Whitechapel Murders, this book was a very good introduction to the subject. Extremely graphic too, so beware!  I appreciated the appendices at the end which explain a lot of details that might not come as obvious to someone not familiar with Victorian London (or London all together), with many expressions, the author's though process and the choices made in different panels throughout the book. That was clever and of great help!