Mathilda  is a short yet deeply intense novel written by Mary Shelley  between 1819 and 1820, though it remained unpublished until 1959. In this work, Shelley delves into dark psychological territory, exploring themes of solitude, guilt, and forbidden love. The story follows Mathilda, a young woman who loses her mother at birth and grows up in isolation until her father returns to her life. However, their reunion takes a tragic turn when he confesses an incestuous love for her, plunging Mathilda into despair and emotional exile.

Beyond its provocative plot, the novel stands out for its melancholic tone and its deep exploration of the protagonist's psyche, reflecting Shelley's personal struggles following the loss of her husband and children. Mathilda moves away from traditional Gothic horror to offer a poignant meditation on human suffering, showcasing Shelley's literary talent beyond Frankenstein and solidifying her place in the Romantic literary tradition.