It is 1941, and America teeters on the brink of war. Outgoing naval officer Ensign Jim Avery escorts British convoys across the North Atlantic in a brand-new destroyer, the USS Atwood. Back on shore, Boston Navy Yard secretary Mary Stirling does her work quietly and efficiently, happy to be out of the limelight.

Lt. Mellie Blake is looking forward to beginning her training as a flight nurse. She is not looking forward to writing a letter to a man she’s never met - even if it is anonymous and part of a morale-building program. Lt. Tom MacGilliver, an officer stationed in North Africa, welcomes the idea of an anonymous correspondence - he’s been trying to escape his infamous name for years. As their letters crisscross the Atlantic, Tom and Mellie develop a unique friendship despite not knowing the other’s true identity. When both are transferred to Algeria, the two are poised to meet face-to-face for the first time.

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.

When the Germans march into Denmark, Baron Henrik Ahlefeldt exchanges his nobility for anonymity, assuming a new identity so he can secretly row messages for the Danish Resistance across the waters to Sweden. American physicist Dr. Else Jensen refuses to leave Copenhagen and abandon her research-her life's dream. While printing resistance newspapers, she hears stories of the movement's legendary Havmand-the merman-and wonders if the mysterious and silent shipyard worker living in the same boardinghouse has something to hide.

The only way Cilla van der Zee can survive the German occupation of the Netherlands is to do the unthinkable—become a spy for the Nazis in Britain. She soothes her conscience with a plan to abandon her mission and instead aid the Allies. Her scheme is thwarted when naval officer Lt. Lachlan Mackenzie finds her along the Scottish shore and turns her in to be executed. But perhaps she is more useful alive than dead.

Munich, 1938. Evelyn Brand is an American foreign correspondent as determined to prove her worth in a male-dominated profession as she is to expose the growing tyranny in Nazi Germany. To do so, she must walk a thin line. If she offends the government, she could be expelled from the country - or worse. If she fails to truthfully report on major stories, she'll never be able to give a voice to the oppressed - and wake up the folks back home.

When German bombs set London ablaze, BBC radio correspondent Hugh Collingwood reports on the Blitz, eager to boost morale while walking the fine line between truth and censorship. But the Germans are not the only ones Londoners have to fear as a series of murders flame up amid the ashes. The deaths hit close to home for Hugh, and Aleida needs his help to locate her missing son. As they work together, they grow closer and closer, both to each other and the answers they seek. But with bombs falling and continued killings, they may be running out of time.

As the beloved stepdaughter of the Earl of Castleton, Lady Mariah Lyons cherishes her home at Plumford Manor, but her idyllic world will be threatened when the estate passes to Cyril Lightbourne, a childhood friend she hasn’t seen or heard from in years. Once, Mariah dreamed their friendship would kindle into something more, but that was before she heard Cyril was courting the cruelhearted Lady Pearl. Now Mariah is willing to welcome him as a friend and pray he will be the heir her stepfather needs, but she’ll keep her heart locked safely away from anyone with such poor taste.

The year is 1901, and the hustle and bustle of the holidays is descending on New York's Fifth Avenue. For the first time in her privileged life, Adelaide Forsythe couldn’t be happier about the prospect of a quiet Christmas. That’s not to say her transition from Missto Mrs. has been without challenge. Though she doesn’t regret marrying for love instead of wealth, she feels woefully unprepared to run her own household. Then, on the first Sunday of Advent, winter winds bring surprising change, first through a young orphan boy and then a seasoned housekeeper who seems too good to be true.

Left with an estate on the brink of bankruptcy after their father's death, Lady Marigold Fairfax and her brother open a private investigation firm marketed to the elite . . . to spy on the elite. Dubbed The Imposters, Ltd., their anonymous group soon becomes the go-to for the crème of society when they want answers delivered surreptitiously. But the many secrets Marigold learns about her peers pale in comparison to her shock when she and her brother are hired to investigate her best friend's father as a potential traitor.

Upon uncovering her tyrannical father’s malevolent plot to commit her to an asylum, Beth Rutledge fabricates a plan of her own. She will rescue her mother, who had already been sent to the asylum, and escape together on a wagon train heading west. Posing as sisters, Beth and her mother travel with the pioneers in hopes of making it to Idaho before the others start asking too many questions.

France, 1939: A talented singer, Ruth Lacroix has left Maine to live with her aunt and uncle, dreaming of performing at the Casino de Paris. But with the outbreak of war, and the heartbreaking news that her cousin has been killed by German forces, that goal is supplanted by another—to support France in any way she can.

1950. In the wake of the war, Audrey Clarkson leaves her manor house in England for a fresh start in America with her young son. As a widowed war bride, Audrey needs the support of her American in-laws, whom she has never met. But she arrives to find that her longtime friend Eve Dawson has been impersonating her for the past four years. Unraveling this deception will force Audrey and Eve’s secrets - and the complicated history of their friendship - to the surface.

Gracie Thompson has a job, a loving family, a twin brother who drives her insane and a great friend. A chance meeting introduces her to the love of her life. But the storm clouds are gathering, Europe is teetering on the verge of war and threatening to destroy everything Gracie holds dear. When war arrives her family are split up, her younger siblings evacuated, her brothers join up to serve, her boyfriend, Charlie, is in daily danger and her life is threatened.

Beauty has been nothing but a curse to Penelope Snow. When she becomes a personal maid for a famous actress whose troupe is leaving Chicago to tour the West, she hides her figure beneath shapeless dresses and keeps her head down. But she still manages to attract the wrong attention, leaving her prospects in tatters—and her jealous mistress plotting her demise.

It is 1941, and America teeters on the brink of war. Outgoing naval officer Ensign Jim Avery escorts British convoys across the North Atlantic in a brand-new destroyer, the USS Atwood. Back on shore, Boston Navy Yard secretary Mary Stirling does her work quietly and efficiently, happy to be out of the limelight.

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.

When the Germans march into Denmark, Baron Henrik Ahlefeldt exchanges his nobility for anonymity, assuming a new identity so he can secretly row messages for the Danish Resistance across the waters to Sweden. American physicist Dr. Else Jensen refuses to leave Copenhagen and abandon her research-her life's dream. While printing resistance newspapers, she hears stories of the movement's legendary Havmand-the merman-and wonders if the mysterious and silent shipyard worker living in the same boardinghouse has something to hide.

When German bombs set London ablaze, BBC radio correspondent Hugh Collingwood reports on the Blitz, eager to boost morale while walking the fine line between truth and censorship. But the Germans are not the only ones Londoners have to fear as a series of murders flame up amid the ashes. The deaths hit close to home for Hugh, and Aleida needs his help to locate her missing son. As they work together, they grow closer and closer, both to each other and the answers they seek. But with bombs falling and continued killings, they may be running out of time.

The only way Cilla van der Zee can survive the German occupation of the Netherlands is to do the unthinkable—become a spy for the Nazis in Britain. She soothes her conscience with a plan to abandon her mission and instead aid the Allies. Her scheme is thwarted when naval officer Lt. Lachlan Mackenzie finds her along the Scottish shore and turns her in to be executed. But perhaps she is more useful alive than dead.