For decades, the whereabouts of The Fifteen has been an unsolved mystery. All the members of this reclusive commune outside Philadelphia vanished twenty years ago, except for one: a twelve-year-old girl found wandering alone on the side of the road. In the years since that morning, Lee Burton has tried to put the pain of her past behind her, building a new identity for herself with a doting husband and seven-month-old daughter, Lucy. But motherhood is proving a bigger challenge than she anticipated. She doesn’t want to let Lucy out of her sight even for a moment.

1940, Italy. Lili and Esti have been best friends since they first met at university. When Esti’s son Theo is born, they become as close as sisters. While a war seethes across borders, life somehow goes on—until Germany invades Italy, and the friends suddenly find themselves in occupied territory. Esti, older and fiercely self-assured, convinces Lili to join the resistance efforts. But when disaster strikes, a critically wounded Esti asks Lili to take a much bigger step: To go on the run with Theo. Protect him while Esti can’t.

Gabby and Fred have just begun to adapt to their new life as empty nesters when Gabby makes a stunning realization: she can’t stand her husband. One night at a bar, Gabby meets an enigmatic younger woman named Ellis, and in a haze of drunkenness, she confesses that she wishes Fred dead. Surely she didn’t expect anything to come of it, but when she tries to track Ellis down again, she realizes that Ellis might not have been who she said she was.

Chicky Diaz is everyone’s favorite doorman at the Bohemia, the most famous apartment house in the world, home of celebrities, financiers, and New York’s cultural elite. Up in the penthouse, Emily Longworth has the perfect-looking everything, all except her husband, whom she’d quietly loathed even before the recent revelations about where all the money comes from. But his wealth is immense, their prenup is iron-clad, and Emily can’t bring herself to leave him. Yet.

London, 1953. Louise is still adjusting to her postwar role as a housewife when she discovers a necklace in a box at a secondhand shop. The box is marked with the name of a department store in Paris, and she is certain she has seen the necklace before, when she worked with the Red Cross in Nazi-occupied Europe—and that it holds the key to the mysterious death of her friend Franny during the war. Following the trail of clues to Paris, Louise seeks help from her former boss Ian, with whom she shares a romantic history.