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. Instead, she gets the shock of her life, which upends her whole world. Still reeling, Darcy flees to Paris to see Zoe. But a rapidly escalating worldwide health crisis forces her to remain indefinitely in France. Suddenly thrust into a gray zone of her own, her forced separation from Zoe and the rest of her family feels like too much to bear . . . Until Darcy finds a welcoming refuge in the home of the aging French movie star Sybille Carton. There, she meets a widowed American engineer and former Marine who is also stranded. Bill Thompson is kind and courteous but also carries an air of mystery about him. In this shared confinement, and despite worries about her girls, Darcy begins to see glimpses of new possibilities.