Freshly hired as a labor nurse in a chemical factory, Nour discovers that small arrangements exist between management and her father, Slimane, the staff representative, and the company's pivot. Lies about polluting discharges, hidden illnesses of employees, hidden accidents ... Nour, little by little, no longer accepts the compromises of his father to preserve the image of the company. She decides to launch the alert.

Inspector Joseph Kimball Kobé and his team investigate a mysterious cult of serial killers calling themselves "the lost souls." They are determined to save the world from this threat.