Narrating from her deathbed, Mathilda, a young woman barely in her twenties, writes her story as a way of explaining her actions to her friend, Woodville. Her narration follows her lonely upbringing and climaxes at a point when her unnamed father confesses his incestuous love for her. This is then followed by his suicide by drowning and her ultimate demise; her relationship with the gifted young poet, Woodville, fails to reverse Matilda's emotional withdrawal or prevent her lonely death.
The novella begins with readers becoming aware that this story is being narrated in the first person, by Mathilda, and that this narration is meant for a specific audience in answer to a question asked prior to the novella's beginning: "You have often asked me the cause of my solitary life; my tears; and above all of my impenetrable and unkind silence."[8] Readers quickly learn that Mathilda is on her deathbed and this is the only reason she is exposing what seems to be a dark secret.
Mathilda's narrative first explores the relationship between her mother and father, and how they knew each other growing up. Mathilda's mother, Diana, and her father were childhood friends; Mathilda's father found solace in Diana after the death of his own mother and the two married not long after. Mathilda, as narrator, notes that Diana changed Mathilda's father making him more tender and less fickle. However, Mathilda was born a little more than a year after their marriage and Diana died a few days after her birth, causing her father to sink into a deep depression. His sister, Mathilda's aunt, came to England to stay with them and help care for Mathilda, but Mathilda's father, unable to even look at his daughter, left about a month after his wife's death and Mathilda was raised by her aunt.
Mathilda tells Woodville that her upbringing, while cold on the part of her aunt, was never neglectful; she learned to occupy her time with books and jaunts around her aunt's estate in Loch Lomond, Scotland. On Mathilda's sixteenth birthday her aunt received a letter from Mathilda's father expressing his desire to see his daughter. Mathilda describes their first three months in each other's company as being blissful, but this ended first when Mathilda's aunt dies and then, after the two return to London, upon Mathilda's father's expression of his love for her.
Leading up to the moment of revelation, Mathilda was courted by suitors which, she noticed, drew dark moods from her father. This darkness ensued causing Mathilda to plot a way of bringing back the father she once knew. She asked him to accompany her on a walk through the woods that surrounded them and, on this walk, she expressed her concerns and her wishes to restore their relationship. Her father accused her of being "presumptuous and very rash."[9] However, this did not stop her and he eventually confessed his incestuous desire regarding her. Mathilda's father fainted and she retreated back to their home. Her father left her a note the next morning explaining that he would leave her and she understood that his actual intent was to commit suicide. Mathilda followed him, but was too late to stop him from drowning himself.
For some time after his death, Mathilda returned to society as she became sick in her attempts to stop her father. She realized, though, that she could not remain in this society and she faked her own death to ensure that no one would come looking for her. Mathilda re-established herself in a solitary house in the heath. She has a maid who came to care for the house every few days, but other than that she had no human interaction until Woodville also established residence in the heath about two years after she chose to reside there.
Woodville was mourning the loss of his betrothed, Elinor, and a poet. He and Mathilda struck a friendship; Woodville often asked Mathilda why she never smiled but she would not go into much detail regarding this. One day, Mathilda suggested to Woodville that they end their mutual sorrows together and commit suicide. Woodville talked Mathilda out of this decision, but soon after had to leave the heath to care for his ailing mother. Mathilda contemplates her future after his departure, and while walking through the heath, gets lost and ends up sleeping outside for a night. It rains while she sleeps outside and, after she makes her way back to her home, she becomes extremely sick.
It is in this state that Mathilda decides to write out her story to Woodville as a way of explaining to him her darker countenance, even though she recognizes that she does not have much longer to live.
