Harper Lee's "To Kill a Mockingbird" is a novel that explores the racial tensions and injustices of the American South in the 1930s. The story is told through the eyes of Scout Finch, the daughter of lawyer Atticus Finch, who defends Tom Robinson, a black man falsely accused of raping a white woman. The novel has become a classic of American literature and is known for its powerful themes of racism, injustice, and the loss of innocence.