Author : Steve Tarani
the single best book I've read on pre-attack indicators and ways to read and adjust to possible attacks. Having spent 20 plus years as a peace officer in a violent portion of the Southwest this book highlights a lot of things I try and explain to folks. It spells it out clearly and breaks down things to a layman's level.
Unfortunately it is out of print and copies can be difficult to locate. If you can find one snag it up.
Steve's current book " Your most powerful weapon" looks good to but I have not started it yet.
Hope this helps.