The author has produced a very readable book, which goes into detail on personality disorders, character disorders and pschoses, among others, and not only reports findings on the "disorders" of the criminal mind, but also offers tips and ideas on how a writer can use both characters of "unstable mind" as well as the pschologists and criminologists who study and treat them.

Those of us who want to write about murder/homicide/serial-killing etc should definitely invest in this book.