In July 1944, Arielle von Auspeck arrives at the glamorous Hotel Ritz in occupied Paris. Half French, half German, she is happy to be back in France, where her husband, Gregor, a retired colonel, will join her soon from Germany. Arielle and Gregor have thus far been able to hide their private opposition to Hitler. Then her world falls apart. She receives word that Gregor was part of Operation Valkyrie, a failed attempt to assassinate Hitler in Poland, and has been shot as a traitor.

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.

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.

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.

With wit and intelligence, Danielle Steel explores love in all its guises, taking us into the lives of three unusual but wonderfully real couples. One Day at a Time is at once moving, thought provoking, and utterly impossible to put down.