This shell of a ghost story is an excuse to house one of the most openly classist and misogynistic books I've read. Leave it to some rich white dead dude to tell me how women will never have confidence in the face of men, will fawn to serve them on site, how boys should never stoop to be in the company of women when they could be around men, and that servants should know their place and also know they should never try to rise above it.
Do I know why these ghosts are haunting children? No. Do I know anything about the lead female characters other than they utterly worship the male child they're watching over? No.
Anything interesting or beyond surface level about this world or its characters were entirely created by The Haunting of Bly Manor Netflix show. Save the 4 hours you'd spend listening to this audiobook and give it to that instead. You'll get far more out of it.