The Innocents 1961

Miss Giddens is hired as a governess at a luxurious estate to care for two orphaned children, Flora and Miles. The girl looks like an absolute little angel, and Miles, who has returned from school early, is also well-mannered, but Miss Giddens senses that the children are hiding something. For some reason, the boy was expelled from school, and it turns out that the estate is haunted by the ghosts of the former governess and gardener, who passed away not long ago.