Liane Moriarty has reached a level of success few authors can claim. She has written eight best sellers, including “Big Little Lies,” “Apples Never Fall” and “The Husband’s Secret.” Several of her novels have been adapted for television, in limited series that star actors including Nicole Kidman, Reese Witherspoon, Annette Bening and Meryl Streep. All told, Moriarty has sold more than 20 million books.

Despite all that success, the author shows little interest in becoming a “brand.” In fact, she doesn’t particularly enjoy talking about herself.

But Moriarty, 57, has a new book: “Here One Moment,” which will be published on Sept. 10. And so, ahead of her book’s release, Moriarty spoke to The Times in a video interview from her home in Sydney about her work habits, the challenges of doing publicity, and how one moment can change the course of a life.

Her new novel explores that conceit. It is about a woman on a flight from Hobart, in Australia, to Sydney, who stands up mid-flight and starts telling passengers how and when they will die. She walks down the aisle of the airplane, points at them, one by one, and names their end — pancreatic cancer, age 66, or intimate partner homicide, age 25.

“Fate won’t be fought,” she says. Then the plane lands, and its passengers have to figure out how to go about their lives with these predictions in mind.