Chapters Ten and Eleven represent the end of Jem's and Scout's keen interest in the Radley house and specifically in Boo. Lee chooses to the divide the novel into two plots which she ties together at the end. Chapters Ten and Eleven temporarily end the first plot (Boo Radley), but Lee adeptly uses the book's first section to foreshadow the second section (Tom Robinson's trial). Boo and Tom are the novel's mockingbirds--they do good for others and mean no harm, but others, through misunderstanding and prejudice "harm" both characters.
The novel's first part also ends Jem's and Scout's innocence. As they obsess over Boo's "dark" past and present, they play childish games with Dill and engage in imaginative schemes to get Boo to come out of his house. As the trial begins, Jem and Scout endure harsh comments from Maycomb's residents, realize that not everything in life is just, and begin to view their father as a hero.