Perfect Nanny is a psychological thriller novel written by Leila Slimani. The story follows a young couple, Myriam and Paul, who hire Louise as a nanny for their two children. At first, Louise seems like the perfect nanny - she is attentive, caring, and efficient. However, as time goes on, Myriam and Paul start to notice strange behavior from Louise. She becomes possessive and controlling, leading to a chilling climax that will leave readers on the edge of their seats.