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.