Cybersecurity is a relatively new foreign policy problem. A decade ago, it received little attention, but since 2013 the Director of National Intelligence has named cybersecurity risks the biggest threat facing the nation. The non-profit Council on Foreign Relations “Cyber Operations Tracker” contains almost 200 state sponsored attacks by 16 countries. The list includes one attack in 2005 when the data base starts, but over 20 last year. The bad news is that the threat is increasing; but the good academic news is that the problem is now attracting a new generation of bright young scholars–as illustrated by Ben Buchanan’s book and its reviewers.