What are some common themes in Catcher in the Rye, Huckleberry Finn, and Extremely Loud and Incredibly Close?

I'm writing an essay on the thematic content links between these books and how i would be able to teach it extremely loud and incredibly close in an ap English language course course. Also, how does ut connect to other novels we read (Catcher in the Rye & Huckleberry Finn)