How to Kill a Mockingbird takes place in a town in Alabama called Maycomb. This story is in the 1930s which was a time of depression, racism, and prejudice. It revolves around the Finch family, which is composed by Atticus FInch (the father and a prominent lawyer), Jean Louise 'Scout' Finch (the daughter and 2nd born), and Jem Finch (the son and 1st born).
Tom Robinson, a young black man, is accused of raping Mayella Ewell, a white woman. Atticus is then asked to represent Tom in court. However this isn't easy because to win this case and prove Tom's innocence Atticus must overcome the prejudice and preconceptions that the people of Maycomb have against Tom.
Since Atticus is representing a black man, Scout and Jem become a canter of attention in the town. Atticus' children learn valuable lessons about commitment, justice, and what's right as they go through several tribulations of their own throughout the trial.
Even though Tom is innocent, he is declared guilty and is sentenced to death on the electric chair. Jem and Scout, who are innocent children, can't believe that people whom they knew would give such punishment to an innocent man.