Family book club with a twist

My adult children and I have started a book club with a twist. We either live far apart or are all busy and want to be able to connect beyond social media.

The idea is that everyone reads a different book and annotates that book in a specific highlighter or pen colour. And then we rotate and read each others books and how they annotated.

They are 22-28 years old and I am mid 50s. All avid readers.

Books have to be fiction, relatively short, and appeal to a large audience.

Suggest me a book. I’m stumped! My daughter is reading Little Women and my son A Separate Peace. The other two haven’t decided so this could help them too.

Books we all have loved include The Book Thief, Anne of Green Gables, Wicked, etc. My son loves Vonegut, Berendt so I’d like to venture into his genre a bit too.