Super Short Summary

The Cocktail Party follows a troubled married couple, Edward and Lavinia, who, with the help of a mysterious therapist named Sir Henry Harcourt-Reilly, attempt to mend their fractured relationship after Lavinia briefly leaves. Through a series of encounters with the therapist and other guests at a cocktail party, the couple confronts their issues, while another character, Celia, embarks on a journey seeking personal fulfillment.