The society of Maycomb County had a definitive structure containing four classes. The first and upper class consisted of white collar Caucasians who were considered "rich" in the post-depression years. Characters who fit into this class were Atticus Finch, a wealthy, highly respected lawyer and citizen in town, and Judge Taylor, the justice of Maycomb County and presiding judge at the Robinson trial. Other characters who belonged to this upper class were Miss Maudie Attkinson, an open-minded, kind woman, and Miss Stephanie Crawford, the renowned gossip of the town.
Wills returned to Australia aboard the Oneida steamship, arriving in Melbourne on 23 December 1856. The minor port city of his youth had risen to world renown as the booming financial centre of the Victorian gold rush .  Horatio, now a member of the Legislative Assembly in the Victorian Parliament , was living on "Belle Vue", a farm at Point Henry near Geelong , the Wills' family home since 1853.  In his first summer back in Melbourne, Wills stayed with his extended family, the Harrisons, at their home on Victoria Parade , and entered a Collins Street law firm to appease his father, but he seems never to have practiced; the few comments he made about law suggest it meant little to him.  "Tom was no dunce", writes Greg de Moore. He was "negotiating a path to greatness." 
Circumstantial evidence is "indirect" evidence, which means that there is no direct evidence, such as a witness to a crime. Circumstantial evidence would be a witness to the aftermath of a crime, such as seeing a person holding a gun and a dead person on the ground in front of him. That person (holding the gun) could have come upon the scene and (stupidly) picked up the gun. It doesn't mean he shot the victim. In chapter 23 Atticus says he did have misgivings about them giving the death penalty based on circumstantial evidence.