Esme is born into a world of words. Motherless and irrepressibly curious, she spends her childhood in the Scriptorium, an Oxford garden shed in which her father and a team of dedicated lexicographers are collecting words for the very first Oxford English Dictionary. Young Esme’s place is beneath the sorting table, unseen and unheard. One day a slip of paper containing the word bondmaid flutters beneath the table. She rescues the slip and, learning that the word means “slave girl,” begins to collect other words discarded or neglected by the dictionary men.

In a sprawling mansion filled with peculiar treasures, January Scaller is a curiosity herself. As the ward of the wealthy Mr. Locke, she feels little different from the artifacts that decorate the halls: carefully maintained, largely ignored, and utterly out of place. Then she finds a strange book. A book that carries the scent of other worlds and tells a tale of secret doors, of love, adventure, and danger. Each page turn reveals impossible truths about the world, and January discovers a story increasingly entwined with her own.

August 1939: London is dismal under the weight of impending war with Germany as Hitler’s forces continue to sweep across Europe. Into this uncertain maelstrom steps Grace Bennett, young and ready for a fresh start in the bustling city streets she’s always dreamed of - and miles away from her troubled past in the countryside. With aspirations of working at a department store, Grace never imagined she’d wind up employed at Primrose Hill, an offbeat bookshop nestled in the heart of the city - after all, she’s never been much of a reader.

Hans Castorp is, on the face of it, an ordinary man in his early 20s, on course to start a career in ship engineering in his home town of Hamburg, when he decides to travel to the Berghof Santatorium in Davos. The year is 1912 and an oblivious world is on the brink of war. Castorp’s friend Joachim Ziemssen is taking the cure and a three-week visit seems a perfect break before work begins. But when Castorp arrives he is surprised to find an established community of patients, and little by little, he gets drawn into the closeted life and the individual personalities of the residents.

Rhode Island, 1846. Estranged from his family, writer Merritt Fernsby is surprised when he inherits a remote estate in the Narragansett Bay. Though the property has been uninhabited for more than a century, Merritt is ready to call it home—until he realizes he has no choice. With its doors slamming shut and locking behind him, Whimbrel House is not about to let Merritt leave. Ever.

Summer 1940: Hedy Bercu fled Vienna two years ago. Now she watches the skies over Jersey for German planes, convinced that an invasion is imminent. When it finally comes, there is no counterattack from Allied forces - the Channel Islands are simply not worth defending. Most islanders and occupying forces settle into an uneasy coexistence, but for Hedy, the situation is perilously different. For Hedy is Jewish — a fact that could mean deportation, or worse.

The Bahamas, 1941. Newly widowed Leonora “Lulu” Randolph arrives in Nassau to investigate the governor and his wife for a New York society magazine. After all, American readers have an insatiable appetite for news of the duke and duchess of Windsor, that glamorous couple whose love affair nearly brought the British monarchy to its knees five years earlier. What more intriguing backdrop for their romance than a wartime Caribbean paradise, a colonial playground for kingpins of ill-gotten empires? Or so Lulu imagines.

On an unnamed island off an unnamed coast, objects are disappearing: first hats, then ribbons, birds, roses - until things become much more serious. Most of the island's inhabitants are oblivious to these changes, while those few imbued with the power to recall the lost objects live in fear of the draconian Memory Police, who are committed to ensuring that what has disappeared remains forgotten. When a young woman who is struggling to maintain her career as a novelist discovers that her editor is in danger from the Memory Police, she concocts a plan to hide him beneath her floorboards.

By day, 17-year-old Jo Kuan works as a lady's maid for the cruel daughter of one of the wealthiest men in Atlanta. But by night, Jo moonlights as the pseudonymous author of a newspaper advice column for the genteel Southern lady, "Dear Miss Sweetie". When her column becomes wildly popular, she uses the power of the pen to address some of society's ills, but she's not prepared for the backlash that follows when her column challenges fixed ideas about race and gender.

After a whirlwind romance, London teashop waitress Fleur Richards can’t wait for her new husband, Hugh, to return from the Great War. But when word of his death arrives on Armistice Day, Fleur learns he has left her a sizable family fortune. Refusing to accept the inheritance, she heads to his beloved home country of Australia in search of the relatives who deserve it more.

American socialite Lily Durham is known for enjoying one moment to the next, with little regard for the consequences of her actions. But just as she is banished overseas to England as a “cure” for her frivolous ways, the Great War breaks out and wreaks havoc. She joins her cousin in nursing the wounded at a convalescent home deep in the wilds of Scotland at a crumbling castle where its laird is less than welcoming.

Australia, 1906: Orphan Jane Piper is nine years old when philanthropist siblings Michael and Elizabeth Quinn take her into their home to further her schooling. The Quinns are no strangers to hardship. Having arrived in Australia as penniless immigrants, they now care for others as lost as they once were. Despite Jane’s mysterious past, her remarkable aptitude for mathematics takes her far over the next seven years, and her relationship with Elizabeth and Michael flourishes as she plays an increasingly prominent part in their business.

As the daughter of Sir Alfred Whitford, Kat has a certain set of responsibilities. Chasing her wayward sister, Ellie, to Nazi-occupied Paris was never supposed to be one of them. Now accustomed to the luxurious lifestyle that her Nazi boyfriend provides, Ellie has no intention of going back to the shackled life their parents dictate - but Kat will stop at nothing to bring her sister home.

Onna Gebowa is determined to become a great wizard. She can write the parameters of a spell faster than any of the young men in her village school. But despite her incredible abilities, she’s denied a place at the nation’s premier arcane academy. Undaunted, she sails to the bustling city-state of Hexos, hoping to find a place at a university where they don’t think there’s anything untoward about providing a woman with a magical education.

When Captain Rafe Lancaster is invalided out of the Britannic Imperium's Aero Corps after crashing his aerofighter during the Second Boer War, his eyesight is damaged permanently, and his career as a fighter pilot is over. Returning to London in late November 1899, he's lost the skies he loved, has no place in a society ruled by an elite oligarchy of powerful Houses, and is hard up, homeless, and in desperate need of a new direction in life. Everything changes when he buys a coffeehouse near the Britannic Imperium Museum in Bloomsbury, the haunt of Aegyptologists.