The world's foremost expert on Middle Eastern relations explains Iran's current nuclear potential and what America can do about it: "Engrossing...If Congress gets a vote on going to war with Iran, let's hope that this book is on everyone's reading lists" (The Economist).

In 2005, Kenneth Pollack's first book about foreign policy in Iran, The Persian Puzzle, sparked a national conversation, laying out the possible options for nuclear deterrent in Iran. But, despite the attention his solutions received, the world didn't follow his advice. Now, Iran is even closer to...