The Scarlet Letter is an 1850 romantic work of fiction in a historical setting, written by Nathaniel Hawthorne, and is considered to be his magnum opus.

Set in 17th-century Puritan Boston, Massachusetts during the years 1642 to 1649, it tells the story of Hester Prynne, who conceives a daughter through an affair and struggles to create a new life of repentance and dignity.

Throughout the book, Hawthorne explores themes of legalism, sin, and guilt. (Excerpt from Wikipedia)