Josef Brzek is 73 years old when his son Petr takes him to the Pardubice archives of the Ministry of the Interior, where the StB files are kept. He had wanted to go there for a long time, but his wife Věra had talked him out of it. He just wanted to make sure that those he suspected were really StB agents. But the facts he encountered in the records were completely unexpected. The betrayal came from those closest to him, from his family...