1906: Lady Elizabeth “Libby” Sinclair, with her love of microscopes and nature, isn’t favored in society. She flees to the beautiful Isles of Scilly for the summer and stumbles onto the dangerous secrets left behind by her holiday cottage’s former occupant, also named Elizabeth, who mysteriously vanished. Oliver Tremayne - gentleman and clergyman - is determined to discover what happened to his sister, with the help of the girl now living in what should have been Beth’s summer cottage...especially when he realizes it’s the curious young lady he met briefly two years ago.

Cordelia Owens can weave a hopeful dream around anything and is well used to winning the hearts of everyone in Savannah with her whimsy. Even when she receives word that her sweetheart has been lost during a raid on a Yankee vessel, she clings to hope and comes up with many a romantic tale of his eventual homecoming to reassure his mother and sister.

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.

Three years into the Great War, England's greatest asset is their intelligence network - field agents risking their lives to gather information, and codebreakers able to crack every German telegram. Margot De Wilde thrives in the environment of the secretive Room 40, where she spends her days deciphering intercepted messages. But when her world is turned upside down by an unexpected loss, for the first time in her life numbers aren't enough.

In 1942, Evie Farrow is used to life on Ocracoke Island, where every day is the same—until the German U-boats haunting their waters begin to wreak havoc. And when special agent Sterling Bertrand is washed ashore at Evie's inn, her life is turned upside down. While Sterling's injuries keep him inn-bound for weeks, making him even more anxious about the man he's tracking, he becomes increasingly intrigued by Evie, who seems to be hiding secrets of her own.

Patrick O'Neill survived a hardscrabble youth to become a lawyer for the downtrodden Irish immigrants in his community. He's proud of his work, even though he struggles to afford his ramshackle law office. All that changes when he accepts a case that is sure to emphasize the Blackstones' legacy of greed and corruption by resurrecting a 30-year-old mystery. Little does Patrick suspect that the Blackstones will launch their most sympathetic family member to derail him.

Sabina Mancari never questioned her life as the daughter of Chicago's leading mob boss until bullets tear apart her world and the man she thought she loved turns out to be an undercover Prohibition agent. Ambushes, bribes, murder, prostitution—all her life, her father sheltered her from his crimes, but now she can no longer turn away from the truth. Maybe Lorenzo, the fiance who barely paid her any attention in the last two years, has the right idea by planning to escape their world. But can she truly turn her back on her family?

For Hudson, the newly titled Viscount Stildon, moving to England from India where he was born and raised was already an arduous enough endeavor. When he learns the fate of the racing empire he inherited along with his title depends upon him getting in the good graces of another stable owner, he's even more at a loss. The stable at the neighboring estate has been Miss Bianca Snowley's refuge for years, and when a strange man appears to be stealing the horses, she jumps to their protection without a second thought.

When Miss Rebecca Lane returns to her home village after a few years away, her brother begs for a favor: Go to nearby Swanford Abbey and deliver his manuscript to an author staying there who could help him get published. Feeling responsible for her brother's desperate state, she reluctantly agrees.

Abigail was born free, but when her parents die, she's sold into slavery to the family of a Roman soldier in Jerusalem. Fortunately, the Visibullis family is kind, and as years pass, she's proud to serve them. But Abigail's beauty attracts unwanted attention when their son, Jason, returns from Rome. She doesn't dare to defy him...but how can she ever love him as he demands? As Jerusalem boils with political unrest and the stories of a rabbi named Jesus who snags Jason's attention, Abigail struggles to find her new place in the family.

Miss Gwendolyn Brinley accepted a temporary paid companion position for the Newport summer season, believing it would be a lark to spend the summer in America's most exclusive town. She suddenly finds her summer turning anything but amusing when her employer expects her to take over responsibilities as an assistant matchmaker. Tasked with the daunting prospect of attaining advantageous matches for her clients, Gwendolyn soon finds herself in the company of Mr. Walter Townsend, the catch of the Season, but a gentleman Gwendolyn finds beyond annoying.

Brook Eden has never known where she truly belongs. Though raised in the palace of Monaco, she's British by birth and was brought to the Grimaldis under suspicious circumstances as a babe. When Brook's friend, Justin, uncovers the fact that Brook is likely a missing heiress from Yorkshire, Brook leaves the sun of the Mediterranean to travel to the moors of the North Sea, to the estate of her supposed family.

Kasia grew up in a poor Jewish home with more siblings than luxuries. But when a chance encounter forces her to the palace of Xerxes, she becomes a concubine to the richest man in the world. She alone, of all Xerxes's wives, loves the man beneath the crown. She alone, of all his wives, holds the heart of the king of kings. Traveling with Xerxes through Europe as he mounts a war against Greece, Kasia knows enemies surround her, but they're not the Spartans or Athenians. The threat lies with those close to the king who hate her people.

When their father's death leaves them impoverished, Sarah Summers and her genteel sisters fear they will be forced to sell the house and separate to earn livelihoods as governesses or companions. Determined to stay together, Sarah convinces them to open their seaside home to guests to make ends meet and provide for their ailing mother. Instead of the elderly invalids they expect to receive, however, they find themselves hosting eligible gentlemen. Sarah is soon torn between a growing attraction to a mysterious Scottish widower and duty to her family.

In 1715, Lady Blythe Hedley's father is declared an enemy of the British crown because of his Jacobite sympathies, forcing her to flee her home in northern England. Secreted to the tower of Wedderburn Castle in Scotland, Lady Blythe awaits who will ultimately be crowned king. But in a house with seven sons and numerous servants, her presence soon becomes known.

1906: Lady Elizabeth “Libby” Sinclair, with her love of microscopes and nature, isn’t favored in society. She flees to the beautiful Isles of Scilly for the summer and stumbles onto the dangerous secrets left behind by her holiday cottage’s former occupant, also named Elizabeth, who mysteriously vanished. Oliver Tremayne - gentleman and clergyman - is determined to discover what happened to his sister, with the help of the girl now living in what should have been Beth’s summer cottage...especially when he realizes it’s the curious young lady he met briefly two years ago.

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.

In the eyes of London Society, Gillian Phelps is suitable enough. Though the ton whispers about her change of residence, any speculation remains just that: ballroom gossip. No one—not even the other Huntresses, the group of ladies she calls her dearest friends—knows that she is harboring a devastating family secret. Gillian has become adept at hiding the reality of her circumstances, but the close quarters of a house party will test her ability to conceal the crushing truth. And with so many people to deceive, the late arrival of another guest is a most unwelcome surprise.

Cordelia Owens can weave a hopeful dream around anything and is well used to winning the hearts of everyone in Savannah with her whimsy. Even when she receives word that her sweetheart has been lost during a raid on a Yankee vessel, she clings to hope and comes up with many a romantic tale of his eventual homecoming to reassure his mother and sister.

In 1875 California, Brody MacKenzie arrives at the Two Harts Ranch on a mission to find his runaway brothers, worried they may have fallen into harm. Instead, he discovers 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. His options limited, Brody reluctantly takes on the role of ranch doctor, and he forms an unexpected bond with Ellie, who's kept a steady eye on Brody's two rapscallion brothers.

Three years into the Great War, England's greatest asset is their intelligence network - field agents risking their lives to gather information, and codebreakers able to crack every German telegram. Margot De Wilde thrives in the environment of the secretive Room 40, where she spends her days deciphering intercepted messages. But when her world is turned upside down by an unexpected loss, for the first time in her life numbers aren't enough.

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.

Haunted by the death of her sister, Finola Shanahan has resolved that she's not worthy of a family of her own and commits to spending her days caring for immigrants in the slums. Unwilling to consider marriage, Finola has perfected the ability to sabotage the relationships her parents arrange for her. At wit's end, her father calls upon the local Irish matchmaker, who pairs her with successful wagonmaker Riley Rafferty.

At 30 years of age, Susan Jennings has long been considered a spinster. Exceptionally intelligent, she has little tolerance for London and the dreaded Season - if that’s how one is expected to find love, it’s not for her. But when an invitation arrives that cannot be ignored, Susan leaves her comfortable life in the country and enters the fashion and frivolity she most despises. She quickly discovers, however, that there is more to loathe in London - and his name is George Kendall.

In 1921, Marian Arnold, the heiress to a brewing baron’s empire, seeks solace in the glass butterfly house on her family’s Wisconsin estate as Prohibition and the deaths of her parents cast a long shadow over her shrinking world. When Marian’s sanctuary is invaded by nightmarish visions, she grapples with the line between hallucinations of things to come and malevolent forces at play in the present. With dead butterflies as the killer’s ominous signature, murders unfold at a steady pace. Marian, fearful she might be next, enlists the help of her childhood friend Felix.