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.

When she is only six years old, Allegra Dixon’s party-loving mother leaves without so much as a goodbye. Her father, an emotionally distant military officer, is also unable—or unwilling—to care for her. Sent to live like a ghost in her grandparents’ joyless home, Allegra finds her only solace through an escape into books. Attending boarding school, life finally takes a turn when she meets a dashing young West Point cadet named Shep Williams. Soon their friendship blossoms into something more, and they fall deeply in love.

Darcy Gray is a successful influencer with her blog, The Gray Zone, trusted by more than a million followers for her integrity and taste. At forty-two, she has the life she wants in many ways. Darcy and her husband, department store magnate Charles Gray, are a power couple in Manhattan and on the international stage. Their beloved twin daughters are each enjoying their junior year abroad, Penny in Hong Kong and Zoe at the Sorbonne in Paris. To celebrate twenty years of marriage, Darcy impulsively flies to Rome to surprise Charlie, who is tending to business interests there.

Kezia Cooper Hobson, recently widowed, arrives in New York from San Francisco. Determined to make a fresh start, she has just completed the sale of her Pacific Heights home, not to mention her husband's venture capital firm, and in doing so, is also freed from her responsibility as a board member of the company. Bringing with her only a few personal treasures, she is excited to move into the blank slate of a beautiful midtown penthouse, in the city that she has always loved. It is also where her two adult daughters now live.

Abigail O’Hurley Rockwell’s husband was a racing car legend behind the wheel, winning championships with a fearless skill and speed that claimed his life in a tragic and—some would say—reckless crash. Heartbroken, Abby wants nothing more than to raise her two sons in peace, but journalist Dylan Crosby is penning a book about her infamous husband’s life, determined to expose the man’s hidden past. But Abby is not a spoiled trophy wife Dylan can easily charm. She is a woman of integrity and mystery desperate to keep him at arm’s length.

Sophia Alexander, the beautiful daughter of a famous surgeon in Berlin, has had to grow up faster than most young women. When her mother falls ill, Sophia must take charge of her younger sister Theresa, look after her father and the household, while also volunteering at his hospital after school. Meanwhile, Hitler's rise to power and the violence in her very own town have Sophia concerned, but only her mother is willing to share her fears openly. After tragedy strikes and her mother dies, Sophia becomes increasingly involved in the resistance.

Oscar-winning actress Ardith Law is a Hollywood icon. Radiant at sixty-two, she is the epitome of glamour and a highly respected artist. But her success has come at a price: she has a strained relationship with her daughter, Morgan, who at thirty-eight still blames Ardith for putting her career before being a mother. Morgan is a successful plastic surgeon in New York City—and the distance from Ardith's Bel Air mansion is not lost on either of them. Ardith became a single mother when Morgan was seven, after her unfaithful husband died in a helicopter accident.

As the head of a prestigious movie studio for nearly two decades, Andy Westfield has had every conceivable professional luxury: a stunning office on the forty-fourth floor, a loyal assistant who can all but read his mind, access to a private jet and company cars. The son of Hollywood royalty, Andy always put his career before his marriage, and now, besides his daughter and young grandchildren, it’s the only thing he truly loves. But then Andy’s world is upended. The studio is sold, and the buyer’s son demands the top seat. Out of a job and humiliated, Andy spirals.

It's the summer of 1959 and the Palace of Versailles is hosting an event that will make history. It is an exclusive dusk to dawn ball in which a select group of American and French debutantes will be presented to international society and royalty. Four young women, all with something to prove, receive what some see as the invitation of a lifetime.

Faith Ferguson is New York's most in-demand wedding planner, an arbiter of taste for elegant affairs, lavish ceremonies, and exclusive fêtes. She appreciates a simple celebration as much as a dazzling event, for she knows that a dream wedding is not necessarily the most expensive one. As much as Faith enjoys her work, her two failed engagements leave her with no desire to get married herself. She finds fulfillment in her close relationship with her twin sister, Hope, her role as a mentor for her assistant, Violet, and her career.