such conflicts resolved without active third-party intervention. Walter argues that for negotiations to succeed it is not enough for the opposing sides to resolve the underlying issues behind a civil war. Instead the combatants must clear the much higher hurdle of designing credible guarantees on the terms of agreement--something that is difficult without outside assistance. Examining conflicts from Greece to Laos, China to Columbia, Bosnia to Rwanda, Walter confirms just how crucial the prospect of third-party security guarantees and effective power-sharing pacts can be--and that adversaries do, in fact, consider such factors in deciding whether to negotiate or fight. While taking many other variables into account and acknowledging that third parties must also weigh the costs and benefits of involvement in civil war resolution, this study reveals not only how peace is possible, but probable.