The Norland Inheritance picks up five years after the conclusion of Sense and Sensibility, as Margaret, the youngest sister, reaches the age of eighteen. Following the tragic death of their only son in a riding accident, John and Fanny, Margaret's half-brother and sister-in-law, invite her to stay with them in London. John hopes to fulfil his father's neglected wishes by launching Margaret into society at his own expense. Fanny, however, secretly resents this invitation, particularly as her relationship with John has deteriorated since the loss of their son. Despite this, she chooses to bide her time and comply with his wishes for the moment.
With John's passing, the heir to Norland is now Charles Dashwood, a cousin, and a doctor by profession. Shortly after Margaret's arrival, Fanny discovers John's secret desire for Charles to marry Margaret, thus redressing the imbalance of the entail and ensuring that Margaret will be the future mistress of Norland. Fanny's jealousy-fuelled dislike of all of John's sisters, especially Margaret, is so incensed by this potential match that she resolves to stop it by any means within her power. She schemes to marry Margaret off to the first suitor who shows any interest. To this end, she introduces Margaret to a fortune hunter, the dashing Captain Dunning, who pays court to Margaret after Fanny hints that she is to inherit Norland.