Mosquitoes kill more people every year than any other animal, and this film treats that fact as a modern plague to rank alongside the biblical ones. It tracks the diseases they carry, West Nile virus, Zika, dengue fever, and malaria above all, through the researchers, biologists, clinicians, and activists working to contain them. Africa carries the heaviest toll: the film states that a child dies of malaria there roughly every 30 seconds, and it visits communities where the recurring outbreaks are understood in religious terms, as a punishment echoing the plagues of Exodus. The scope widens beyond Africa to show mosquito-borne illness spreading into Central Europe and the United States, undercutting the idea that this is a problem confined to the developing world. Interviews lay out the competing tools on offer, insecticides, breeding-ground removal, education campaigns, and ongoing research, and the disagreements over which combination actually works at scale. The film's case is that a swarm of tiny insects has produced a body count that most wars never reach.