I read the the third edition of this book for fun before I even decided to go back for my Criminal Justice/Biology degree. I kept it so long that I thought the EMU Library was going to send someone to break my legs.
The fourth edition is much improved, with mostly color photos,and updated science and psychology.
Especially interesting is the chapter on homosexual homicide. The purpose of the chapter is to educate the straight, uninformed police officer about gay culture, so that he or she can tell when something is amiss. This brings to mind the horrible misunderstanding that lead to the one of Jeffrey Dahmer's victims. The officers who were called to the scene were unfamiliar and uncomfortable dealing with a gay "lover's spat," and therefore just let Dahmer take his "drunk" "lover" back to his apartment, where he was murdered minutes later.
You should read this book if you want to know how real detective work is done.
The photos are quite disturbing.