My Mortal Enemy (Hardcover) (ISBN-13: 9781957990989)

Myra and her husband Oswald return to their fictional hometown of Parthia, Illinois, to visit their relatives. Nellie and Aunt Lydia then leave to spend the Christmas holiday in New York City with them. They live on Madison Square. They dine with Ewan Gray, a friend who has an infatuation with another actress, Esther Sinclair. Oswald receives silver-buttons for his shirt from an old Western acquaintance, and asks Lydia to pretend she gave them to him to thwart his wife's jealousy. Later Myra and Nellie go to the opera; in a lodge they spot an erstwhile friend of Myra's, which makes her sad. Later they take a hansom around a park and chance upon a rich acquaintance of Myra's, which leads her to be scornful over her own poverty. They spend Christmas dinner with friends of the Henshawes - both artists and people of privilege. Later they spend New Year's Eve with artists again. A few days later Nellie witnesses the Henshawes argue; the husband takes her out to lunch. Soon after, she and her aunt are to return to Illinois. On the train, they are joined by Myra, who has argued with her husband again and is going to visit a friend in Pittsburgh for a change of scenery.

Ten years later, Nellie moved into a shabby flat in a little town on the west coast, and bumps into the Henshawes. Myra is now bedridden and Oswald works full-time; their upstairs neighbours are atrociously noisy, regardless of Myra's illness. Nellie takes to visiting her at tea-time; she also takes her out by the sea. Myra expresses her regrets over her husband. (If she had not married him, her great-uncle would have bequeathed her his fortune. Instead, she eloped and he gave it away to the church.) Oswald takes to having lunch with a young woman. Once, Nellie asks her why she is so harsh on her husband, and Myra dismisses her. Shortly after, her condition gets worse. She dismisses everyone and runs away; she is found dead by the seaside the following day. Her husband expresses no remorse about his wife; he loved her despite her difficult conduct. After her death he moves to Alaska and later Nellie hears about his death.