The arrival of identical twin brothers into the life of a blind woman, Lucilla Finch, initiates a complex web of deception and romantic rivalry. Lucilla Finch, a young woman who has been blind since childhood, finds her life altered when she meets Oscar Dubourg, a man she believes to be her ideal partner. However, the narrative complicates this connection through the presence of Oscar's twin brother, Nugent, whose physical similarity to Oscar creates a series of ethical and romantic dilemmas. The story unfolds through a multi-perspective framework that examines the limitations of perception and the social constraints placed upon individuals with disabilities in the nineteenth century.

Readers and critics often note that this work occupies a unique space within the author's bibliography by blending traditional sensation tropes with a more psychological focus. Discussion frequently centers on the effectiveness of the portrayal of Lucilla's blindness, which is often praised for its nuance and departure from the period's typical sentimental tropes. Many readers highlight the tension generated by the identical twins, noting how the author uses this device to challenge the protagonist's autonomy and perception. The narrative pacing is frequently described as deliberate, allowing for a deep examination of the characters' moral choices rather than relying solely on plot-driven action.