In Spying with Maps, the "mapmatician" Mark Monmonier looks at the increased use of geographic data, satellite imagery, and location tracking across a wide range of fields such as military intelligence, law enforcement, market research, and traffic engineering. Could these pervasive forms of geographic monitoring, he asks, lead to grave consequences for society? To assess this very real threat, he explains how geospatial technology works, what it can reveal, who uses it, and to what effect.