In 1958, Anna Jurin accepts a job as a housekeeper of Saint Ange, a rusty and isolated orphanage located in the French Alps and owned by Madam Francard. The last batch of children have been sent elsewhere shortly after the mysterious death of a boy in the bathroom, which tarnishes the orphanage's reputation and threatens its closure. Other than Anna, the orphanage is now populated by only two people: the long-time cook Helenka and an adult orphan, Judith, who suffers from a mental disability and claims that there are other, unseen, children in the location.