Coincidentally I just caught the last five minutes of it last night.
It's a well known book. Sort of wish I'd seen the serial. But finding time for catch-up might be different. Maybe next time it's screened on TV.
Definitely weird, Bigbad, and I wondered why I also watched it every week! It was never clear to me what exactly happened in "Mrs. Appleyard's" younger days. I've never been a fan of flashbacks but this one really took the prize.