Ava thought her job as a librarian at the Library of Congress would mean a quiet, routine existence. But an unexpected offer from the US military has brought her to Lisbon with a new mission: posing as a librarian while working undercover as a spy gathering intelligence. Meanwhile, in occupied France, Elaine has begun an apprenticeship at a printing press run by members of the Resistance. It’s a job usually reserved for men, but in the war, those rules have been forgotten. Yet she knows that the Nazis are searching for the press and its printer in order to silence them.

India, 1986: Mukta, a 10-year-old village girl from the lower-caste Yellama cult, has come of age and must fulfill her destiny of becoming a temple prostitute, as her mother and grandmother did before her. In an attempt to escape her fate, Mukta is sent to be a house girl for an upper-middle class family in Mumbai. There she discovers a friend in the daughter of the family, high-spirited eight-year-old Tara, who helps her recover from the wounds of her past.

It is 1987, and a small Irish community is preparing for a wedding. The day before the ceremony, a group of young friends, including the bride and groom, are involved in an accident. Three survive. Three are killed. The lives of the families are shattered and the rifts between them ripple throughout the small town. Connor survived, but living among the angry and the mourning is almost as hard as carrying the shame of having been the driver. He leaves the only place he knows for another life, taking his secrets with him.

London, 1940. Emmeline Lake is Doing Her Bit for the war effort, volunteering as a telephone operator with the Auxiliary Fire Services. When Emmy sees an advertisement for a job at the London Evening Chronicle, her dreams of becoming a Lady War Correspondent suddenly seem achievable. But the job turns out to be working as a typist for the fierce and renowned advice columnist Henrietta Bird. Emmy is disappointed but gamely bucks up and buckles down.

Clara Button is no ordinary librarian. While war ravages the city above her, Clara has risked everything she holds dear to turn the Bethnal Green tube station into the country’s only underground library. Down here, a secret community thrives with thousands of bunk beds, a nursery, a café, and a theater—offering shelter, solace, and escape from the bombs that fall upon their city. Along with her glamorous best friend and assistant Ruby Munroe, Clara ensures the library is the beating heart of life underground. As the war drags on, the women's determination is tested to the limits.

When hopeful fashionista Meg Julliard must return to her hometown of Chicago to manage her late father’s apartment building, she thinks her dreams of making it in the fashion business are over. Ellie Wade, one of the building’s longtime residents, is also not feeling the Christmas joy this year. Ellie and Meg strike up an unlikely friendship, and the story of Ellie’s dress comes out. Ellie gifts the gorgeous dress to Meg, hoping that it will bring her more luck, on the condition that she wear it to the building’s Christmas party.

Kabul, 1978: The daughter of a prominent family, Sitara Zamani lives a privileged life in Afghanistan’s thriving cosmopolitan capital. The 1970s are a time of remarkable promise under the leadership of people like Sardar Daoud, Afghanistan’s progressive president, and Sitara’s beloved father, his right-hand man. But the ten-year-old Sitara’s world is shattered when communists stage a coup, assassinating the president and Sitara’s entire family. Only she survives.

Japan, 1957. Seventeen-year-old Naoko Nakamura’s prearranged marriage to the son of her father’s business associate would secure her family’s status in their traditional Japanese community, but Naoko has fallen for another man - an American sailor, a gaijin - and to marry him would bring great shame upon her entire family. When it’s learned Naoko carries the sailor’s child, she’s cast out in disgrace and forced to make unimaginable choices with consequences that will ripple across generations.

Paris, 1939: The Nazis think Éliane can't understand German. They’re wrong. They think she’s merely cataloging art in a Louvre museum and unaware they’re stealing national treasures for their private collections. They have no idea she’s carefully decoding their notes and smuggling information to the Resistance. But Éliane is playing a dangerous game. Does she dare trust the man she once loved with her secrets, or will he only betray her once again?

An advertisement has been placed (again!) by the wealthy and eccentric Parloni Sisters. The salary is generous and the employers are 90 years old, so how hard could the job be? Well, none have lasted longer than a week. Most boys leave in tears. Ruthie Midona will work in Providence’s front office, and be at the Parlonis' beck and call, forever. That’s sort of her life plan. If Ruthie can run the place in her almost-retired bosses’ absence, with no hijinks/hiccups, she has a shot at becoming the new manager.

It's 1983 and seventeen-year-old Grace Clark has just lost her mother when she begrudgingly accompanies her estranged father to an archeological dig at Olduvai Gorge on the Serengeti plains of Tanzania. Here, seventy-year-old Mary Leakey enlists Grace to sort and pack her fifty years of work and memories. Their interaction reminds Mary how she pursued her ambitions of becoming an archeologist in the 1930s by sneaking into lectures and working on excavations.

Lillian and Madison were unlikely roommates and yet inseparable friends at their elite boarding school. But then, Lillian had to leave the school unexpectedly in the wake of a scandal, and they’ve barely spoken since. Until now, when Lillian gets a letter from Madison pleading for her help. Madison’s twin stepkids are moving in with her family, and she wants Lillian to be their caretaker. However, there’s a catch: The twins spontaneously combust when they get agitated, flames igniting from their skin in a startling but beautiful way.

Porter Beck is the sheriff in the high desert of Nevada, north of Las Vegas. Born and raised there, he left to join the Army, where he worked in Intelligence, deep in the shadows in far off places. Now he's back home, doing the same lawman's job his father once did, before his father started to develop dementia. All is relatively quiet in this corner of the world, until on old, retired FBI agent is found killed. He was brutally tortured before he was killed and clues at the scene point to a mystery dating back to the early days of the nuclear age.

It is 1951, and at number six Sycamore Street, fifteen-year-old Edie Green is lonely. Living with her eccentric mother and her mother's new boyfriend, she is desperate for something to shake her from her dull, isolated life. So when the popular, pretty Lucy Theddle befriends Edie, she thinks all her troubles are over. Even though Lucy has a secret, one Edie is not certain she should keep. Then Lucy goes missing. Now in 2018, Edie is eighty-four and still living in the same small town, when one afternoon she glimpses Lucy Theddle, still looking the same as she did at fifteen.

Hollywood, 1955. As head costume designer for Lux Pictures, Lena Taylor hears startling confessions from the biggest movie stars. She knows how to keep their secrets—after all, none of their scandals can match her own. Lena was once Elsie Gruner, the daughter of an Ohio dressmaker. Her gift for fashion design helped her win a coveted spot at an art academy in Rome. While in Italy, she became enthralled by the charismatic Julia, who drew her into a shadowy world of jazz clubs, code words, and mysterious deliveries.