Charlotte’s mother is murdered at her house out in the country. Why she is murdered and who killed her are not known. Charlotte who works as a sound engineer herself decides to try to unravel the mystery of this case and find out who murdered her mom. Charlotte goes alone to stay at her mother\'s house and realizes that she has little idea about her mother\'s life. When she sets up a recorder and a microphone in the house and sounds from past plots and affairs begin to be heard accidentally through the mike. The mysteries of ominous plots set in shadows are gradually revealed in the powerful relationships between a policeman, a politician and an environmentalist whose secrets were known only by Charlotte\'s mother. And the people in her neighborhood treated her mother like a witch. Using the heroine Charlotte\'s job as a sound engineer, this French thriller maximizes the auditory effects and reveals the secrets of the house like a traditional device of a gothic story. It is also visually pleasurable to watch Charlotte digging into the truth of her mother\'s murder case in a way of connecting the source of each sound with threads of truth. (KIM Sunah)