Cyber crime, cyber espionage, and even cyber war have in recent years become issues of immediate concern to senior government leaders and industry executives, threatening to undermine the great benefits of a globally networked society. Interest has grown among policymakers regarding international norms, or agreed upon rules of behavior, as a method for managing the risk posed by transnational cyber threats. However, to this point, international cybersecurity norm development has been anemic. Securing Cyberspace Through International Norms, prepared by Richard A. Clarke and Good Harbor Security Risk Management, offers a potential path forward. By learning from past norm development efforts, focusing on a limited number of cybersecurity issues, and including private sector stakeholders in global discussions, the international community can make short term progress on strong cybersecurity norms and set the stage for more comprehensive negotiations in the future.