Peter goes to a park where Septimus and Lecrezia are also walking. The couple get into a heated discussion about suicide, and Peter sees them as a young and in love couple quarreling. He doesn't realize the depth of their emotions or how unsteady Septimus is. Lecrezia has made an appointment for Septimus to see a specialist, Sir William Bradshaw, who dismisses the complexity of Septimus's madness and suggests a rest in an asylum to get more perspective.
Meanwhile, Richard Dalloway has been to lunch with Lady Bruton. Clarissa was somewhat miffed that Lady Bruton invited only Richard and not her, and sees it as a remark on Clarissa's validity. Richard has realized during this lunch that he wants to come home and tell Clarissa that he loves her. Unfortunately, he never finds the words, as he has gone so many years without saying them.
Clarissa goes to see Elizabeth, who is studying with her tutor, Doris Kilman. Clarissa despises Doris, who she sees as a monster with "hooves" taking her daughter from her. Doris also despises Clarissa, largely for her bourgeois ways and financial means.
Septimus and Lecrezia go to their apartment to wait for the attendants who will take him to the asylum. When they arrive, Septimus decides to escape from them, and not wanting to leave life but not wanting to meet the attendants, he jumps out the window to his death.
Clarissa's party is underway, with several ghosts from her past – including Peter Walsh and Sally Seton – in attendance. Richard has still been unable to tell her that he loves her. Very late into the party, Sir William and Lady Bradshaw arrive, very apologetic for their tardiness. Lady Bradshaw explains that they were delayed as one of Sir William's patients (Septimus) had committed suicide that day. The party ends with Clarissa surprisingly disappointed at the success of her party.
