The book collects 3 years of researches in the penetration testing security field. It does not describe underground or fancy techniques, it is most focused on the state of the art in penetration testing methodologies. In other words, if you need to test a system, how do you do ? What is the first step ? What tools can be used ? what is the path to follow in order to find flaws ?
The book shows many real world examples on how the described methodology has been used. For example: penetration testing on electronic voting machines, how malware did use the describe methodology to bypass common security mechanisms and attacks to reputation systems.