“Every day I wonder why my life has turned out this way,” a millionaire novelist named Alice writes to her friend Eileen in “Beautiful World, Where Are You,” out from Farrar, Straus & Giroux on Sept. 7. “I never advertised myself as a psychologically robust person, capable of withstanding extensive public inquiries into my personality and upbringing.”

Neither did the novel’s author, Sally Rooney. “This sounds terrible, but I’m trying not to have a meltdown about doing more publicity,” she said during a video interview in July from a hotel room in Dublin. She’d taken the train in that morning from Castlebar, a town on the other side of Ireland where she lives with her husband, John Prasifka.

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