Great classic Gothic Horror, it successfully combines atmosphere with classic haunted house and ghost story.  All the while with just enough ambiguity that you don’t know if the children are lying or the governess is going mad.  Classic unreliable narrator.  This very much had the atmosphere and feeling of a Jane Eyre/ Edgar Allan Poe.  My only gripe is the over done language from Henry James at times you didn’t know if the governess was w talking to a child or her lover which was just weird and uncomfortable.