Oona Kelly Webster has much to be grateful for. A striking woman with red hair and green eyes, she has a loving family and a job she adores, editing a prestigious line of books. To celebrate their twenty-fifth wedding anniversary, she and her husband, Charles, have planned a visit to France. But then Charles drops a bombshell. He has been living a lie—hiding an affair for a year—and he is leaving Oona for a younger male lover.

Born to a French mother and American father, graceful Dahlia de Beaumont has been sole owner and CEO of the venerable family perfume business based in Paris since her early twenties, following the death of her parents. For twenty-five years, after losing her husband in an avalanche, her life has centered on running Lambert Perfumes and being a devoted single mother to her four children: indecisive Charles, volatile Alexa, kind-hearted business visionary Delphine, and dreamy artist Emma. Now fifty-six, she has an "arrangement" with a married man but has been questioning that relationship.

As she approaches the milestone birthday of forty, delicate blond beauty Amanda Delanoe finds joy in running a chic contemporary art gallery in the City of Light. The only child of a French businessman and an American model, both now deceased, Amanda lives well and adores her dog, Lulu, but so far the love of her life has eluded her.

Alexandra Bouvier is born in Paris in 1900, at the dawn of a new century. From an early age, she is encouraged to think for herself by her enlightened family: her father, a French doctor; her mother, an American nurse; and her maternal grandfather a highly regarded newspaperman back in the Midwest. At age fourteen, Alex's comfortable life is upended as war erupts across Europe. Her parents follow their sense of duty to the front, performing triage at a field hospital and confronting the horrors of poison gas and trench warfare.

Hope Dunne has carved out a name for herself as a top photographer, known the joys of marriage and motherhood and the heartbreak of loss. In her chic SoHo loft, Hope is content with her life, finding serenity and beauty through the lens of her camera. She isn't looking for a man or excitement. But these things find her when she accepts a last-minute assignment to fly to London at Christmas and photograph one of the world's most celebrated writers - an Irish-American author known for novels of thrilling literary darkness.