Ophiucha
Auror
The book for September is Jo Walton's Among Others! Here's a short summary from Amazon.com:
Welsh teen Morwenna was badly hurt, and her twin sister killed, when the two foiled their abusive mother's spell work. Seeking refuge with a father she barely knows in England, Mori is shunted off to a grim boarding school. Mori works a spell to find kindred souls and soon meets a welcoming group of science fiction readers, but she can feel her mother looking for her, and this time Mori won't be able to escape.
This novel doesn't have chapters, exactly, so we'll be splitting the novel up by the dates of her diary entries.
Week One: 1st May, 1975 - 2nd November, 1979
Week Two: 3rd November, 1979 - 18th December, 1979
Week Three: 19th December, 1979 - 23rd January, 1980
Week Four: 24th January, 1980 - 20th February, 1980
I'll post some discussion questions towards the end of each week. This is a fairly recent book (2011) and a popular one, so it should be easy to find at your local bookstore or library, and is available for Kindle and on Audible.