Lusagne, late afternoon. The children of the summer camp are returning from a mountain excursion, but Justine, 10, is missing the call. Her instructor, Marianne Helme, who was looking for her, did not come home either. Alex and Angelo mobilize volunteers and discover with fright the body of Marianne, stranded in a torrent, but no trace of Justine. Very soon, the suspicions are about Jeremy Veal, a retarded, light mental, who survives through odd jobs. is led under good escort to the rural police station, before which already camp residents claiming justice...