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.

Bridget Collins is in dire straits - she needs to get out of New York, fast. With two young siblings under her wing, her options are limited. Her priest sends her as an outplacement agent on the orphan trains that run from New York to out west. With almost 40 orphans under her care, she's relieved that fellow and more experienced outplacement agent Carl Watson is there to guide her. But Carl is dealing with his own trauma and finds it difficult to handle the pain the orphans are dealing with.

When Sophie Weiss boards the SS St Louis, she has no reason to stay in Germany. The Nazis have taken everything from her, and her only hope is escape. But when she meets fellow Jewish refugees Rosa, Hannah and Rachel on board, the friendship they form gives Sophie hope that there can be happiness in her future, after all.

1852 Illinois. Eva Thompson has her future mapped out. Marriage to David Clarke and a family is all she wants. Her Pa has other ideas. He insists on taking the Oregon Trail to a better life and favors Harold Chapman as Eva's suitor. Marriage to Harold will provide Eva with everything she needs except . . . love.

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.

Ania hears the explosion of gunshots before she sees the Nazi soldiers approach her beloved home. Her family don’t have time to run, but she does. Hiding nearby, she listens to her sister’s screams and – stroking the red ribbon she keeps tied around her wrist – she begins to plot her revenge… Taunted her whole life for being smarter than anyone else in the village, now living in war-torn Poland, being governed by Nazis who think Poles are subhuman and women only good for one thing… Ania now only has her wits to rely on, if she's going to survive.

In 1944, American naval officer Lt. Wyatt Paxton arrives in London to prepare for the Allied invasion of France. He works closely with Dorothy Fairfax, a "Wren" in the Women's Royal Naval Service. Dorothy pieces together reconnaissance photographs with thousands of holiday snapshots of France - including those of her own family's summer home - in order to create accurate maps of Normandy. Maps that Wyatt will turn into naval bombardment plans. As the two spend concentrated time together in the pressure cooker of war, their deepening friendship threatens to turn to love.

For Stella Bled Lawrence, being wealthy and stylish in 1938 is exactly what it's cracked up to be. She's blissfully unaware of the rising tensions in Europe even as she travels to Vienna on the eve of the Kristallnacht, the Night of Broken Glass. Stella and her husband, Nicky, witness the night's atrocities firsthand. Even as they watch the horror, they never imagine it will touch them personally, a pair of wealthy Americans on their honeymoon, but touch them it does.

The rumblings of war in distant countries mattered little to Danny McClain. Growing up in Chicago, his world revolved around afterschool jobs, a rescued beagle, his pen pal in Holland, and the Cubs' chance to go to the World Series. Then, in December of 1941, news of the attack on Pearl Harbor hit much too close to home. In a few years, Danny found himself in the copilot seat of a B-17, stationed with the 390th Bomb Group in Framlingham, England.

In 1875 California, Brody MacKenzie arrives at Two Hearts Ranch on a mission to find his runaway brothers, worried they may have fallen into harm. Instead, he finds them thriving at the ranch's school and orphanage under the care of Ellie Hart, a woman with a heart as resilient as the land she calls home.

In a small town in upstate New York in 1928, four-year-old Evelyn Wilson goes missing. Instantly, old prejudices claw to the surface. As a frenzy of panic and bloodlust overwhelms all reason, the community turns on the Schatzman family. A terrible witch hunt follows. The Schatzmans' young son is accused of horrifying crimes. As their life in America falls apart, leaving nothing but anguish and devastation, some of the Schatzmans decide to return home to Berlin. But Germany in the 1930s is no safe harbor.

Brzeziny, Poland, 1939. Zofia's comfortable lifestyle overturns when her husband, Jabez, who monitors Nazi activity, has gone missing. Rather than fleeing the country with her young son, as she had promised Jabez who is fearing retaliation, she decides to stay. She cannot possibly leave her friend, Aanya. Since their childhood they have amazed fellow Brzeziners that it does not matter that Aanya is Jewish and deaf, and that Zofia is Catholic and hearing. Now, more than ever with war looming, Zofia will do whatever is necessary to protect her family and Aanya.

While war rages across the world, Kate struggles on her family farm by the wild Atlantic Ocean. But when she meets American airman Tony, whose blue eyes are as stormy as the sea, her life collides with the war in ways she never imagined.Their time is cut short when Tony leaves for war, promising to come back for her. Only then does Kate learn she is carrying his child - and when her family finds out, she is shunned and banished to a Magdalen Laundry to be imprisoned.

1940, Liverpool: Alice Turner and her best friend, Millie Markham, work for the war effort at Rootes munitions factory, making shell caps and Halifax bombers. Alice’s sweetheart, Terry, is home from the front for a brief period of leave. But the honeymoon is soon over. Terry must go back to the dangers of Nazi-occupied France, and the ever-present air raid sirens quickly bring Alice back down to earth.

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.