In Saint-Étienne, an old, wooded village, Isabelle, a young woman, tries to unravel the mystery surrounding her father's sudden death. When she arrives at her mother's house with her friend, the latter acts as if nothing is wrong. On the other hand, Dr. Toupin is everywhere and seems to be pulling the strings in all sorts of matters. As more and more strange incidents occur around her, Isabelle discovers that something more sinister and horrific is going on than she could ever have imagined.