Clarissa Dalloway prepares for an evening party in 1923 London while the mental collapse of a veteran named Septimus Warren Smith unfolds in parallel. Clarissa navigates the social expectations of her status as a politician's wife, balancing domestic preparations with internal reflections on her past choices and the passage of time. Simultaneously, Septimus struggles with the trauma of war and the indifference of the medical establishment, his perception of reality fracturing under the weight of his experiences. The narrative framework utilizes a fluid, non-linear structure that shifts between the internal consciousness of multiple characters, mapping their psychological states against the physical backdrop of a single day in the city.

Readers frequently highlight the effectiveness of the stream of consciousness technique in capturing the interiority of the characters. Discussion often centers on the stark contrast between the domestic concerns of Clarissa and the profound psychological distress experienced by Septimus. Critics often note the precision with which the author evokes the atmosphere of post-World War I London. The balance between the mundane details of party planning and the existential weight of the characters' reflections remains a primary subject of analysis for scholars and casual readers alike.