Always a keen observer and deflater of American mores, Wilder found his dream couple in Jack Lemmon and Shirley MacLaine. Lemmon plays a young and ambitious office worker who, in the hopes of currying favor from his higher-ups, lends his apartment to corporate execs for romantic trysts with their mistresses. At the same time he becomes more and more attached to the elevator operator Fran Kubelik (MacLaine.) When these two aspects of his romantic and work life begin to conflict, he finds himself in a real quandary. A near-perfect film, romantic and world-weary in equal proportions.