A Bargain for Frances by Russell Hoban illustrated by Lillian Hoban

My six year old read this book to himself and then we read it aloud together at a later date.
Frances' friend, Thelma, often takes advantage of her.  In this story she plays a very dirty trick but Gloria (Frances' sister) discovers it.  How will Frances handle her discovery?
I did not really appreciate how the girls treat each but their actions create an opportunity to discuss friendship and how to treat others (and mostly how not to!).
Guided Reading Level: K (second grade)
Grade Level Equivalent: 2.6
Points to discuss: friendship; being mean/selfish; What is a good friend?
Prior to reading discuss the word "bargain".
-We own this book.