It's a book of hacker anecdotes. "Kevin Mitnick" is the author name on the cover, but these are stories from other hackers. They're good stories. They're not all true stories; some of them have parts that don't make sense. They're not all good people; some of these folks, when you slow down and think about the activities they describe, you realize wow, this guy's a total jerk. Probably my favorite story was about the time that a company wanted to acquire L0pht and simultaneously hired them to pen-test. The L0pht folks successfully broke in... and found the company's communications about how to negotiate the acquisition.