A Fierce Domain: Conflict in Cyberspace, 1986-2012 is the first book of its kind- a comprehensive, accessible history of cyber conflict. A Fierce Domain reaches back to look at the major "wake-up calls," the major conflicts that have forced the realization that cyberspace is a harsh place where nations and others contest for superiority. The book identifies the key lessons for policymakers, and, most importantly, where these lessons greatly differ from popular myths common in military and political circles.
A very good history of cybersecurity and cyber war that does something other books on the subject don't do very well: It lays out ways that the cyber domain hasn't changed much at all in the past 40 years, putting the lie to certain cliches about cyber, including that everything were facing is new, so we don't know how to even think about these issues strategically. On the contrary, many of the complaints you hear about cyberstrategy now sound identical to those of 10, 20, and 30 years ago (the book has a chart of these statements). Certainly, nuclear strategy wasn't "all new" 40 years after we invented the bomb. This is worth reading if you've been trying to think rigorously about cyber but always end up feeling that there is something missing from other accounts.
This book starts in a good pace going from the first worm to the most advanced cyber weapon to date: stuxnet. It is written by many hands and, in the middle, gets a bit tiresome with a lot of politics. Pages and pages about how governments dealt with the rapid escalation of cyber threats converging to the ongoing militarization.