For 70 years, the thinking inside the Pentagon was that only nations with nuclear weapons could threaten America’s existence. But that assumption is now in doubt: in a world in which almost everything is interconnected – phones, cars, electrical grids, and satellites – everything can be disrupted, if not destroyed. In THE PERFECT WEAPON, Belfer Center Senior Fellow and Adjunct Lecturer in Public Policy David Sanger, the New York Times national security correspondent, details how this new revolution, being conducted largely in secret, is reshaping global power.

Iran’s top nuclear negotiator was heading back to Tehran on Sunday to consult with his nation’s leadership, as negotiators remained divided over how to limit and monitor Tehran’s nuclear program and even on how to interpret the preliminary agreement they reached two months ago.

Five former members of President Obama’s inner circle of Iran advisers have written an open letter expressing concern that a pending accord to stem Iran’s nuclear program “may fall short of meeting the administration’s own standard of a ‘good’ agreement” and laying out a series of minimum requirements that Iran must agree to in coming days for them to support a final deal.

Payam Mohseni, Director of the Iran Project at the Belfer Center for Science and International Affairs, Dennis Ross, International Council Member, Belfer Center, and David Sanger, Senior Fellow at the Belfer Center, discuss for The New York Times the stakes in the current Iran nuclear negotiations, including the risks of lifting sanctions on Iran, the difficulties in reaching an agreement, and the importance of the current political moment for both Iran and the U.S. in reaching a deal.

President Obama's administration came to office with the world on fire. Confront and Conceal is the story of how, in his first term, Obama secretly used the most innovative weapons and tools of American power, including our most sophisticated—and still unacknowledged—arsenal of cyberweapons, aimed at Iran's nuclear program.

Confront and Conceal—with an updated epilogue for this paperback edition—provides an unflinching account of these complex years of presidential struggle, in which America's ability to exert control grows ever more elusive.