Life is calm and fairly predictable. Until something unthinkable happens in our sleepy backwater. A crime, but not like anything I've ever seen before. It's a complete mystery. And it's up to me to solve it.

Grace Fitzgerald, a fiery-haired dreamer, longs to escape the confines of her windswept Dingle fishing village. Across the Atlantic, Richard Lewis, heir to a Savannah banking fortune, suffocates under the weight of societal expectations he can't quite understand. When their worlds collide through a twist of fate, Grace and Richard uncover a bond so profound it shakes the very foundations of their existence. As Europe inches towards chaos, they find themselves caught in a whirlwind of discovery, challenging everything they thought they knew about themselves and each other.

For eighteen year old Lena O'Sullivan, life is predictable and dull. A future of hard work, marriage to a local boy, and a family of her own one day is all she has to look forward to. People from her background know not to expect too much, but Lena yearns for something different. Malachy Berger was different, for him, the world is at his feet. An only child of a wealthy, if peculiar father, a large inheritance, a beautiful house and a fine education are his due. Nobody is in favour of Lena and Malachy’s friendship, but why not? What harm are they doing? Why is everyone so dead set against it?

The day Titanic sails from Queenstown, taking with it the hopes and dreams of so many, Harp’s life too is devastated. The small port town is shaken to its foundations at the loss of the unsinkable ship, but the revelation of a long-held secret means that Harp and Rose have a much more pressing issue to solve, one that could destroy them if they cannot find a solution.

When her husband doesn’t come home one day, Ariella realises that the only way she can ensure her Jewish children’s safety is to avail of the Kindertransport, but can she bear to let them go? A thousand miles away, Elizabeth Klein has closed herself off from the world. Losing her husband on the last day of the Great War, and her child months later, she cannot, will not, love again. It hurts too much. But she is all Liesl and Erich Bannon have.

When a chance encounter with Theodore Camden, one of the architects of the grand New York apartment house the Dakota, leads to a job offer for Sara Smythe, her world is suddenly awash in possibility - no mean feat for a servant in 1884. The opportunity to move to America. The opportunity to be the female manager of the Dakota. And the opportunity to see more of Theo, who understands Sara like no one else...and is living in the Dakota with his wife and three young children.

Paris, 1944: The war is nearly over, but for members of the Resistance in occupied France, it is more dangerous than ever before. Twenty-five-year-old Gabby Foucher loathes the Nazis, though as the concierge of 10 rue Royale, she does her best to avoid conflict - unlike her bolder sister Yvette, who finds trouble at every turn.

In the summer of 1940, ambitious young American journalist Ruby Sutton gets her big break: the chance to report on the European war as a staff writer for Picture Weekly newsmagazine in London. She jumps at the chance, for it's an opportunity not only to prove herself, but also to start fresh in a city and country that know nothing of her humble origins. But life in besieged Britain tests Ruby in ways she never imagined.

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.

Thirteen-year-old Lisa has escaped from Nazi Germany on the Kindertransport. She arrives in London unable to speak a word of English, her few belongings crammed into a small suitcase. Among them is one precious photograph of the family she has left behind. Lonely and homesick, she is adopted by a childless couple. But when the Blitz blows her new home apart, she wakes up in a hospital with no memory of who she is or where she came from. The authorities give her a new name and dispatch her to a children's home. With the war raging around her, what will become of Lisa now?