When the disappearance of children and bloody murders multiply in a small mountain village, an old legend shrouded in sulphur reappears... Commander Guardiano and Captain of the Gendarmerie De Rolan are forced to join forces to uncover the truth.
Yara, a 25-year-old Moroccan girl who has come to study in Paris, has not left her home for several months, as she has been agoraphobic since childhood due to terrible family events. Her only contact is with her grandmother, Najiyah, by telephone. One evening, a mysterious apparition disrupts her daily routine, forcing her to relive her worst fears, driving her to the brink of madness.
