Cukier and Sidel provide a much-needed overview of the global problem of gun violence as a threat to public health, including the effects of violence, the sources of firearms (both legal and illegal), the factors shaping demand, and the interventions aimed at reducing the misuse of guns.

Just as guns know no borders, gun violence has become a global epidemic, killing hundreds of thousands of people each year and injuring many more. The toll is staggering. Experts estimate that there are 35,000 annual gun-related deaths in Brazil, 10,000 in South Africa, 20,000 in Colombia, and 30,000 in...