Whether or not you agree with the conclusions, this book does a fantastic job of clearly laying out the breadth and depth of the role of nuclear weapons in strategic stability, deterrence, assurance, arms control and non-proliferation.
This book could be called "The 1, 2, 3, ... 's of nuclear weapons in the 21st Century" - I was amazed just how many times (uncountable? :) there was an enumerated list of points. While a bit unusual, it actually helped with following a rather complicated (and dry) set of arguments.
If you are interested in the topics of strategic stability, nuclear weapons, international politics, arms control, etc., I recommend reading this book.