The Glimpses of the Moon by Edith Wharton

THE next day a lot of people turned up unannounced for luncheon. They were not of the far-fetched and the exotic, in whom Mrs. Melrose now specialized, but merely commonplace fashionable people belonging to Susy's own group, people familiar with the amusing romance of her penniless marriage, and to whom she had to explain (though none of them really listened to the explanation) that Nick was not with her just now but had gone off cruising. cruising in the AEgean with friends. getting up material for his book (this detail had occurred to her in the night).

It was the kind of encounter she had most dreaded; but it proved, after all, easy enough to go through compared with those endless hours of turning to and fro, the night before, in the cage of her lonely room. Anything, anything, but to be alone.