Many people consider the health problems of the developing world to be insoluble. Tales of incompetence, corruption, governments with inadequate resources, and misguided policies favoring the urban well-to-do make the possibility of large-scale public health program success seem vanishingly small, even with substantial donor inputs. Millions Saved is an attempt to counter that view. The book provides seventeen diverse cases of success in overcoming, or at least controlling, a wide range of major health problems. These successes take place on a large scale, in countries that are among the poorest on the globe, over a long duration (more than five years), and at reasonable costs. The criteria for choosing the cases, the demanding requirement for solid evidence that the health improvement was caused by the interventions, and the attention to costs and economics all add to the strength of the demonstration. They support the implication that these health problems can be overcome in other developing countries and that the rich countries ought to be supporting such efforts. These undeniable successes, however, in turn raise questions. Are the methods replicable and likely to have the same impact in other settings? Are the successes sufficiently likely and low cost to kindle enthusiasm among donors to provide the kind of the longduration funds that these seventeen cases needed? Can one apply the lessons learned from these cases directly to other health problems, in different settings, and still get the same success? And are today’s investment patterns in global health likely to lead to these kinds of successes? The cases in the book were developed under the aegis of the Center for Global Development, a Washington, D.C.–based, nonpartisan think tank, which assembled a group of fifteen experts in global health, public policy, and development economics to form the What Works Working Group. Through the National Institutes of Health’s Fogarty Center and its Disease Control Priorities Project, the group tapped the expertise of more than 300 authorities on international diseases, interventions, and health systems to identify candidate cases. These candidates were then analyzed against demanding criteria: scale, duration, importance of the problem, cost, and ultimately impact. The group put particular emphasis on the quality of the evaluation data—that is, could they demonstrate not only that impact had occurred, but also that it had been the result of the intervention, rather than an accompaniment of economic improvement, improved education, or other nonhealth improvements in the environment of the improving health indicators? The resulting cases are convincing. The interventions chosen had substantial health impact, at reasonable cost, often with major positive economic impact, over long periods of time, and on a large scale in some very poor and difficult environments. The authors include an analysis called “connecting the dots for success” in which they analyze the ingredients common to all of the cases. These are “poB o o k R e v i e w s