This acclaimed and emotionally fought thriller stars Deborah Francois as Melanie, a young woman whose love of music turns in a passion for revenge. Self-possessed and coolly calculating. Melanie finds work as a nanny to the young son of the well-known concert pianist Ariane Foucherat (Catherine Frot). By contrast fragile and insecure. Ariane is taken by her new employee's professional manner and evident musical sensitivity and soon engages her as her personal page turner. But beneath Melanie's seemingly perfect exterior, lies a secret and terrible grudge against Ariane, based on a thoughtless incident from the past that thwarted Melanie's own musical ambitions. Having patiently bided her time for ten long years, she at last prepares to exact her chilling revenge.