FBI cryptographer Eloise Marshall is grieving the death of her brother, who died during the attack on Pearl Harbor, when she is assigned to investigate a seemingly innocent letter about dolls. Agent Phillip Clayton is ready to enlist and head oversees when asked to work one more FBI job. A case of coded defense coordinates related to dolls should be easy, but not so when the Japanese Consulate gets involved, hearts get entangled, and Phillip goes missing. Can Eloise risk loving and losing again?

Sephardic Jew Mathilda Nissim watches in horror as the Germans invade her beloved city of Salonika, Greece. What angers her most is the lack of resistance her people put up to their captors. In secret and at great risk to her life, she continues to publish her newspaper, calling her people to action. She doesn't trust God to help them. When she and her husband find out they are expecting a child, Mathilda may have to resort to desperate measures to ensure her daughter's survival.

A stranger's life hangs in the balance. But to save him is to risk everything. The war is drawing to a close, but the Nazis still occupy part of the Netherlands. After the losses she’s endured, war widow Cornelia is only a shadow of the woman she once was. She fights now to protect her younger brother, Johan, who lives in hiding. When Johan brings Gerrit Laninga, a wounded Dutch Resistance member, to Cornelia’s doorstep, their lives are forever altered.

When Stefania Carmichael steps into the mysterious world of Bletchley Park, she immediately finds herself signing the Official Secrets Act. In whispers, she is told that she’s been recruited because of her talent for languages. Before the war ripped Europe apart, Stefania was living in Rome, charming everyone she met, and engaged to the man of her dreams, handsome and brave Matteo. And now everything has changed. With secrets swirling around the building, Stefania finds it hard to know who to trust, until she forms a close bond with two other new recruits.

In Nazi-occupied Poland, Sofia cannot look her father in the eye. Sofia’s mother, her papa’s cherished wife, is Jewish—how dare he work as a doctor for the SS? She cannot forgive him, even if the bargain was made to spare their lives. In the middle of the night, Isaac emerges from a packed train with hundreds of others. Beneath Auschwitz’s barbed wire, the SS decide prisoners’ fates on the spot—and Isaac is chosen to work. Every breath feels like it could be Isaac’s last, so when he sees a beautiful auburn-haired girl peering out of the farm window, it feels like a dream.

1941. Audrey Coltrane has always wanted to fly. It's why she implored her father to teach her at the little airfield back home in Texas. It’s why she signed up to train military pilots in Hawaii when the war in Europe began. And it’s why she insists she is not interested in any dream-derailing romantic involvements, even with the disarming Lieutenant James Hart, who fast becomes a friend as treasured as the women with whom she flies. Then one fateful day, she gets caught in the air over Pearl Harbor just as the bombs begin to fall, and suddenly, nowhere feels safe.

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.

As bombs fall across Europe, fourteen-year-old Lien Vinke fears that the reality of war is inescapable. Though she lives a quiet life with her mother and older sister, Elif, in their small town of Haarlem, they are no strangers to heartache, having recently suffered an immeasurable loss. And when the Nazis invade the Netherlands, joining the Dutch resistance with Elif offers just the atonement Lien craves.

Never pretty enough to please her gorgeous mother, Allie will do anything to gain her approval - even marry a man she doesn't love. Lt. Walter Novak - fearless in the cockpit but hopeless with women - takes his last furlough at home in California before being shipped overseas. Walt and Allie meet at a wedding and their love of music draws them together, prompting them to begin a correspondence that will change their lives. As letters fly between Walt's muddy bomber base in England and Allie's mansion in an orange grove, their friendship binds them together.

Bold and fearless, Nina Markova always dreamed of flying. When the Nazis attack the Soviet Union, she risks everything to join the legendary Night Witches, an all-female night bomber regiment wreaking havoc on the invading Germans. When she is stranded behind enemy lines, Nina becomes the prey of a lethal Nazi murderess known as the Huntress, and only Nina's bravery and cunning will keep her alive.

Italy, 1943. For Carmela del Bosco, a farm girl in a remote Italian village, sheltering an English spy is the most dangerous thing she could do. If she’s caught by the fascists, it would be the end, especially for her beloved grandmother sleeping soundly upstairs. But taking in the pleading brown eyes of the man calling himself Sebastiano slumped at her door, and his terrible injuries inflicted by the Nazi occupiers, Carmela remembers how Nonna always taught her right from wrong. Risking everything, she hides him in a ruined tower on the edge of the farm.

As the Nazis march toward Paris in 1940, American ballerina Lucie Girard buys her favorite English-language bookstore to allow the Jewish owners to escape. Lucie struggles to run Green Leaf Books due to oppressive German laws and harsh conditions, but she finds a way to aid the resistance by passing secret messages between the pages of her books.

Paris, 1939. Maison Chanel has closed, thrusting haute couture dressmaker Lila de Laurent out of the world of high fashion as Nazi soldiers invade the streets and the City of Lights slips into darkness. Lila’s life is now a series of rations, brutal restrictions, and carefully controlled propaganda while Paris is cut off from the rest of the world. Yet in hidden corners of the city, the faithful pledge to resist. Lila is drawn to La Resistance and is soon using her skills as a dressmaker to infiltrate the Nazi elite.

1941. A talented flier, Jessie Lovelace yearns for a career in aviation. When the civilian flight school in her small Texas town begins to clandestinely train British pilots for the RAF, she fights to become an instructor. But the task isn’t without its perils of near-misses and death. Faced with the weight of her responsibilities, she finds solace with a British officer who knows firsthand the heavy price paid in war . . . until he returns to the battles he never truly left behind.

Lina Meisel, a retired librarian in Florida, is reading the newspaper one morning when she freezes. Her eyes lock on a photograph of a book she hasn’t seen in 65 years - a book she recognizes as The Book of Lost Names. The accompanying article discusses the looting of libraries by the Nazis across Europe during World War II - an experience Lina remembers well - and the search to reunite people with the texts stolen from them so long ago. The book in the photograph is one of the most fascinating cases.