After a long career in the French TV channel TF1, as technician and later manager of the news department’s technical team, Pierre Pézerat decides to make a documentary about his father’s struggles for the amelioration of workers’ health. He meets the asbestos and pesticides victims who thanks to the confidence in the son of Henri Pézerat, they tell their emotional stories of their life of struggle and how they became involuntarily the sentinels of the environment and living space.