A propulsive nonfiction look at the elite squads of scientists, doctors, and infectious disease experts who guard the boundary between public health and pandemics and how they gather data via boots on the ground "shoe-leather epidemiology" in order to save lives. Perfect for fans of Steve Sheinkin and Deborah Heiligman!Picture a detective. What comes to mind? A fast-talking private eye, interrogating a suspect? Or Sherlock Holmes, in his deerstalker hat, discovering clues to catch a killer?Now imagine that the suspect isn't a person but a microscopic menace--a deadly virus or bacteria making people sick. What kind of detective does it take to nab a biological assassin, invisible to the naked eye?Just like detectives, epidemiologists--scientists who study how diseases emerge and spread--interview witnesses and gather clues to identify the cause of illness, locate those who are sick, and uncover the sources of outbreaks to stop them in their tracks.From a quickly spreading cholera outbreak in 1880s London, to a mystery illness in New Mexico that stumped investigators, to the development of the vaccines to fight COVID-19 and more, join acclaimed author Amy Cherrix on a journey to explore the past, present, and future of virus hunting as the world's greatest disease detectives race to crack the medical codes that lead to cures.