I am reading Jerusalem
And I figured I need a lot of help with this. Reading this book is a marathon-like undertaking. I was looking for a family tree-crib sheet and instead (a) discovered so are a lot of people, and (b) found instead this excellent review. No spoilers, I think. Not that it would make any difference in this book.
I initially bought the hardback book and the Kindle edition. Now I have also joined Audible and got the Audiobook.