Great little book unless you are "unstable," then it could push you over the edge. Stalkers, Corporate Bullies, Gangs, Professional Criminals, the IRS and a Host of Government 'Intelligence' Agencies... are groups mentioned.
Interestingly the "how to fight back" are far from the "Get Even" and "Screw You" series by another author.
Best chapter (and point of the book) is "Awareness is the First Line of Defense" unless of course you are already freaked out, then skip this chapter AND the book.
There's also a useful Internet Resource listing in the book.