In early 2013, Edward Snowden revealed that the NSA and its partners had been engaging in warrantless mass surveillance, using the internet, and driven by fear of terrorism under the sign of “security”. In this compelling account, surveillance expert David Lyon guides the reader through Snowden’s revelations: the technological shifts involved, the steady rise of invisible monitoring of innocent citizens, and the implications for how we conceive of privacy in a democratic society infused with the lure of big data. Along the way, Lyon takes in the distinct global reactions to Snowden why he has been called both traitor and patriot and sets out an agenda for rethinking the place of the human in our digital world. Surveillance after Snowden is crucial reading for anyone interested in politics, technology and society.