The film tackles the question of mass surveillance and its degree of acceptance by the population summarized by the argument « I have nothing to hide ». The red thread of the documentary is a voluntary spy experiment conducted on Mister X, a young actor living in Berlin. With his agreement, the metadata of his computer and his smartphone are harvested for a month using spyware, then analyzed by researchers. This is to illustrate the fact that it is then possible to extract a lot of personal information from online services, social networks and mobile applications (Google, Facebook, WhatsApp etc.). This experience is interspersed with interventions by whistleblowers, hackers or victims of surveillance.