To Kill a Mockingbird takes place during the Great Depression in the lazy town of Maycomb County, focusing on the events in the life of Jean Louise "Scout" Finch and her brother Jeremy "Jem" Finch.
Tom Robinson, a black man, is accused if raping Mayella Ewell, a white woman. The Ewell family, however, are considered some of the worst people around. Atticus, Scout's dad and Maycvomb's lawyer, has to defend Tom in the upcoming case.
When word got out that Atticus Finch was defending Tom Robinson, a black man, most people weren't too happy about it. Scout got into fights with people because Atticus defends black people. When the trial comes around, everybody is bursting with anticipation.
During the trial, Scout and Jem along with a friend they met, Dill, sneak in the courtroom and observe the trial. The verdict is called and Tom Robinson is found guilty. The trial itself was mostly unfair, as the bias back then was that all black people were bad.
The defendant is found guilty as charged.
Because Atticus destroyed Bob Ewell's last bit of credibility at the trial, he spits at Atticus, harasses Tom's wife, and even goes as far as to almost killing Jem and Scout. Jem is knocked unconscious, but a shadowy figure saved them.
As it turns out, the one who saved Scout and Jem was Arthur "Boo" Radley, the mysterious man who was said to be a psycho. To not draw attention to Boo, Sheriff Heck Tate covers the story up.