The Scarlet Letter by Nathaniel Hawthorne

The Scarlet Letter, published in 1850, is an American novel written by Nathaniel Hawthorne and is generally considered to be his magnum opus. Set in 17th-century Puritan Boston, it tells the story of Hester Prynne, who gives birth after committing adultery, refuses to name the father, and struggles to create a new life of repentance and dignity.
Throughout the novel, Hawthorne explores questions of grace, legalism, sin and guilt.