The fascinating history and unnerving future of high-tech aerial surveillance, from its secret military origins to its growing use on American citizens.

Part I: The origin of the all-seeing eye. A new threat ; Enemy of the state ; The Gorgon's Stare -- Part II: Our overwatched future. A murder in Baltimore ; Pixels into ploughshares ; What's next for wide-area surveillance ; It takes a million eyes ; Ghost in the stare ; New dimensions ; Watching in every sense -- Part III: Another long road. One hell of a fight ; A murder in Baltimore, redux ; Where power meets fury ; Rules for the eye and the AI.