Without Pity: Ann Rule's Most Dangerous Killers
This is only the second book* I've read by Ann Rule, so the fact that a lot of these stories were reprints (though updated) from other books didn't really bother me.
Most of these cases took place in the 1960's and 70's and were, therefore, cases I'd not heard of before. They were well researched and told in a way that presented the facts, but not in a cold, clinical manner. Though each story was short, you certainly felt for each of the victims in these horrific cases.
There were a few stories I'd rather have not read, especially those involving children and animals as victims. I say this as someone who is a regular viewer of Discovery ID and Oxygen. (I usually switch off shows on those channels when I realize that children or animals are going to be involved.)
*By the by, the only other book I've read by Ann Rule was, If You Really Loved Me. I read it when I was a teenager, and the only thing I remembered about it over the years was that it involved a teenage girl named Cinnamon Brown. I've since seen a couple of shows about the case on one or both of the two networks I listed above.