Passing’s tone is reflective and introspective, as most of the novel focuses on Irene's inner feelings and the contradictions and comparisons that preoccupy her. As the narrative is told from a third-person perspective that focuses on her experiences, Larsen exposes the uncertainties and assumptions that drive Irene’s choices. This introspective approach allows readers to experience how complex Irene’s emotions are, showing the often contradictory way she remembers her struggles with Clare and Brian.
As Irene becomes increasingly suspicious of Clare, the tone shifts to one of mounting anxiety. This change mirrors Irene's growing nervousness and insecurity and highlights her confused feelings about race and identity. Clare’s presence makes Irene question her own choice to pass when it’s convenient for her, which she never used to. Throughout this, the narrator comments on the injustices of segregated New York with a blend of irony and seriousness. Their detached, almost journalistic tone makes Irene’s discomfort and anxiety seem even stronger by comparison.
Approaching the climax of the novel and Clare’s disastrous party, the tone becomes somber and tragic. The narrator’s voice adopts an almost numb quality as they describe Clare’s death and its aftermath. This detached, documentary-like tone at the end of the novel aligns with its ambiguous ending. Irene has to contend with the reality of a life without Clare in it, which—to her shock—is not less complicated than one without her.