Mr. Habig’s family is less antique — his parents met at Tulane — but he still has strong New Orleans credentials: his father, an orthopedic surgeon, was for years the head surgeon of the New Orleans Saints.
In 2009, the couple were married at her alma mater, the Academy of the Sacred Heart Chapel. And afterward, their party at Antoine’s became entangled with the St. Joseph’s Day parade, which was lurching its way through the French Quarter. Three years ago, about six months before their daughter, Lise, was born, they bought a brownstone for $1.75 million in Carroll Gardens, a Brooklyn neighborhood strangely peopled with other New Orleans exiles, said Ms. Babst, who is always running into someone she grew up with when she buys the olive salad at Court Street Grocers.
The century-old house had belonged to an English professor, said Ms. Babst, who had carefully restored much of it, replacing its fireplaces with period mantels in various materials like limestone, slate and wood. It still needed new wiring, new bathrooms, a new kitchen and paint, all of which cost about $300,000, she said.
When she and Mr. Habig moved in, they brought with them a huge quantity of books, a sofa or two, a few chairs and artwork by New Orleans artists like Frank Relle, who makes glowing long-exposure photographs of that city at night. But because Ms. Babst had painted the walls blue, and upholstered what furniture they had in blue, she realized, she said, “that I needed professional help.”
Thrashing around on the Internet, as she put it, she stumbled onto a blog put up by Suzanne and Lauren McGrath, a mother-daughter design team whose work most resembled what Ms. Babst had in mind. Ms. McGrath senior had worked for Cullman & Kravis and Thierry Despont before becoming the producer, for 10 years, of Martha Stewart’s television show. Lauren McGrath had worked at Teen Vogue.
To explain herself, Ms. Babst sent the McGraths an email that noted, among other things, her preferences between random pairs of things: Manet, not Monet; the Frick, not MoMA; Truffaut, not Godard; autumn, not summer. “If I were going to live in an imaginary house,” she wrote, “I would want it to be designed by Wes Anderson.”
Ms. Babst’s exposition and the McGraths’ response to it yielded often uncanny results. One day, Lauren McGrath showed up with sofa cushions made from a fabric that was weirdly familiar. Ms. Babst couldn’t figure out why, until her mother pointed out it was the same print her grandmother had used to decorate her grandfather’s law offices back in New Orleans.
Last month, Ms. Babst sold her first novel, “The Floating World,” to Algonquin Books. Set in New Orleans in the aftermath of Katrina, it centers on a Creole family shattered by the storm. It was a tale nearly a decade in the making.
“The trauma of losing your city is an existential crisis of the highest order,” Ms. Babst said. “You learn that nothing is secure.” (Her mother, she added, has not yet been able to finish the book.)
Ms. Babst still has the chipped brown Pottery Barn desk she wrote the novel on. But when her advance check comes, she said, she plans to buy a new one that she saw at McNally Jackson, the independent bookstore on Prince Street.
“It’s made with no nails and all these marvelous drawers,” she said. “I love a good drawer. It will be the last piece of the house.”
An earlier version of a picture caption in the slide show with this article misspelled the given name of the artist whose work, “Father Holding His Son,” is pictured. It is George Dureau, not Georges.