Nuclear postures matter. They frame requirements, add to or detract from stability, and can affect outcomes when deterrence fails, which happens more than expected. Vipin Narang covers this ground in his masterful new book, Nuclear Strategy in the Modern Era: Regional Powers and International Conflict (2014). Finally, we have a book on proliferation that is rooted in the discipline of Political Science with persuasive explanatory powers and great analytical value. Vipin’s book has one chapter that only Political Scientists can relate to, but the rest is highly accessible.