Engine

Human Monsters by David Everett is an essential book to have on hand for your serial killer (and mass murderer) informational needs.
That is, it covers many killers (over 150 I think) and it's only 265 pages long. So the write-ups are fairly short but still very informative, thought provoking, and full of fun facts. It's much more than just a list of blurbs. It also covers killers who date back to the 15th century and moves forward chronologically. Not the type of book you sit and read as a narrative but I've still probably read the whole thing 3 or 4 times.

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Like an arrow,
I was only passing through.