Explore how Leigh changes and develops, especially as he nears the end of Dear Mr. Henshaw. Explore not only that he changes, but also include an exploration of what (or who) it is that encourages or grounds his change, and what this means for Leigh. You could examine the role of his mother, his writing, his visit in nature, or any other event or character that shapes him in his development. Be sure to narrow to a specific scene so that you can explore it in depth; be sure to include specific quotes for support.
Book: http://www.arvindguptatoys.com/arvindgupta/henshaw.pdf