Countdown to Zero Day, Kim Zetter, Four Stars

Overall an excellent book. It is history-by-journalist and makes for easy reading, if not always deep reflection. Zetter successfully takes some very complex issues, such as uranium enrichment or zero-day exploits used for computer attacks, and makes them accessible to a broad range of readers. Given the prevalence of both private and state-run computer/network exploitation going on around the world today, this makes an excellent read to become more literate in a threat facing us all in some way or another.
Zetter uncovers a great deal of information, at least some of which the reader would think the actors preferred to keep secret, and does not appear to have favored any particular one government's position. 
Zetter does seem to have the naiveté of unilateral nuclear disarmament advocates, that somehow it is relevant to the state-sponsored continued production and use of zero-day exploits and other malware to have a moral debate about them. Not that such a debate ought not to be had, but one should be realistic as to the possible outcomes. I would highly recommend taking this book together with Lucas KelloLucas Kello's The Virtual Weapon and International Order. Kello gives a far more in-depth look at the context of virtual weapons in the international order, coining the term "unpeace" to describe the cyber state of affairs among nations.
Zetter's book is accessible, informative, and interesting. It covers an area that still suffers a dearth of literature, especially given its importance and relevance to more and more of our daily lives. Definitely an excellent read!