Divorce Is Not the End of the World: Zoe's and Evan's Coping Guide for Kids [Paperback]
Zoe Stern, Evan Stern (Author)
This is the one I read to my boys but I see it is recommended for 9-12yo on Amazon so you'll have to check it out. It talks about how kids can do things/view things themselves to make their own lives better and I liked that aspect of it.