This fragment of a novel was written by Jane Austen in 1804 and remained untitled and unpublished until her nephew James Edward Austen-Leigh printed it in his A Memoir of Jane Austen in 1871. The title is from him.
Mr Watson is a widowed clergyman with two sons and four daughters. The youngest daughter, Emma, has been brought up by a wealthy aunt and is consequently better educated and more refined than her sisters. But when her aunt contracts a foolish second marriage, Emma is obliged to return to her father's house. There she is chagrined by the crude and reckless husband-hunting of two of her twenty-something sisters.
(Summary from Gesine and Wikipedia)