The opening scene is perfection. We meet the eponymous heroine of Diane Johnson’s latest novel, “Lorna Mott Comes Home,” as she rides in the back of a taxi, en route to the train station in Lyon.

Shortly after I turned in my new novel, The Stager, my editor sent me a startling black and white photograph of a woman in a chair. The woman is in a state of graceful repose, with long legs extending into strappy black shoes. She is sultry, sexy, and extremely unsettling. She appears to be beautiful even though you cannot see her face because she is wearing a mask. The art director was suggesting updating this image to use as the cover of the book.

Whether Orion ought to be feet- or head-up in the night sky depends on the hemisphere. When Stan, a 23-year-old student from South Australia, rides his bike through the Rocky Mountains, he marvels that the constellation is upside down.