Paris, 1940: As the German soldiers march down the Champs-Élysées, the Bélanger twins know there is no escape – their lives are about to change forever. But while Sophie, a third-year medical student, works long days and nights saving casualties of war at the American hospital, and waits anxiously for news of her fiancé from the front line, her recently widowed twin, Adèle, is determined to enjoy her freedom. Nothing – not the bombs, the curfews or the Nazi officers sidling up to her in nightclubs – can stop her from indulging in the temptations of Parisian society.

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.

Virginia, 1933: Lauren Greenwood was born to look pretty and land a rich husband. For her and her high-society family, it’s easy to forget that America is in the devastating grip of the Great Depression, where children run wild in the streets, endless queues for soup kitchens line sidewalks, and desperation hangs in the air. But when a young servant comes to Lauren, pregnant and begging for help, her world crumbles. Someone she loves is responsible, and when she finds out the shocking truth she must decide: Protect the Greenwood name or be cast out?

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.

Germany 1939 – To save her baby, Trudi Beck must hand her over to strangers who will take her across the sea to a foreign country. Trudi has already lost her husband to the Nazis, her stepsons are taking the train too. Walking away from the train station with empty arms is the hardest thing she's ever done. London 1939 – Newly married, Sally Matthews, is alone again. Her husband is away training for war, leaving her days and home empty. She volunteers to help with the children from the Kindertransport, becoming captivated by five-year-old Tom and his baby sister, Liesel.

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.

It's February, 1852, and all around Chicago, Maggie sees postings soliciting "eligible women" to travel to the gold mines of Goosetown. A young seamstress with a small daughter, she has nothing to lose. She joins 43 other women and two pious reverends on the dangerous 2,000-mile journey west. None are prepared for the hardships they face on the trek or for the strengths they didn't know they possessed. Maggie discovers she’s not the only one looking to leave dark secrets behind.

Does time heal all wounds? Or do some last forever? Pennsylvania, 1971: Graham Davidson is a young man with survivor’s guilt after the death of three siblings. Estranged from his father and seeking a direction in his life, Graham learns about vision quests from a Crow Indian. He secures seasonal employment in Yellowstone National Park and embarks on a spiritual journey. Wyoming Territory, 1871: Under a full moon at a sacred thermal area, Graham finds himself in Yellowstone a century earlier - one year before it was established as a national park.

Clara Newton is the new Housemother of Shilling Grange Orphanage. Many of the children have been bombed out of their homes and left without families, their lives torn apart by the war, just like Clara’s. Devastated by the loss of her fiancé, a brave American pilot, she is just looking for a place to start again. But the orphans are in desperate need of her help.

In 1870, Mariah Stover is left for dead and with no memory when the Deadeye Gang robs the stagecoach she's on, killing her father and brother. As she takes over her father's blacksmith business and attempts to move forward, the old-fashioned townspeople meet her new occupation with disdain.

The Overland Trail, 1853: Naomi May never expected to be widowed at 20. Eager to leave her grief behind, she sets off with her family for a life out West. On the trail, she forms an instant connection with John Lowry, a half-Pawnee man straddling two worlds and a stranger in both. But life in a wagon train is fraught with hardship, fear, and death. Even as John and Naomi are drawn to each other, the trials of the journey and their disparate pasts work to keep them apart.

A life-altering betrayal leaves Donna Grace alone, unmarried, and pregnant. She's desperate to leave St. Louis, Missouri, and return to Santa Fe, New Mexico, where she grew up, and the only way back is by wagon train. The wagon master refuses to let a single woman drive a wagon without a male escort. Donna knows she can't trust men, but it seems she's going to have to partner with one if she wants to get back home. Luke Russell failed to protect his fiancee. Because of his neglect, she was murdered. When he overhears Donna Grace's predicament, he offers her a marriage of convenience.

In 1848, women can expect a few bumps along the Oregon Trail. Corinne Temple, age 17, has a few ridiculous challenges to face outside the river crossings, snakes, Indians, accidental gunshots, and finding enough privacy to be clean along the grimy trail. When Corinne’s marriage of convenience gets less convenient, she turns to some new friends in the wagon train who help her see the hope for the future. They teach her to take the time to dance and celebrate the small victories, to have faith and determination through the hardest things a person can face.

Jericho Coulter, the eldest of six fiercely devoted brothers, is entrusted with safeguarding his family and the secret that binds them together: the Sapphire mine. To keep tragedy from striking again, he allows no outsiders on their land. When two women stumble upon their ranch, claiming Jericho himself sent for one of them as a mail-order bride, he aims to send them straight back where they came from.

Tessa O’Connor is tired of the high society lifestyle, and the pressure is on for her to marry a wealthy man. Fearful of becoming trapped in a life that would make her increasingly miserable, she decides to try the mail-order bride approach.