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 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.

He was intrigued...Nathaniel Hammond, Earl of Beverton, is working to restore his new estate and aid his tenants. But everything changes when he meets the beautiful and mysterious Moira Dennison, a bold young woman who offers to hire him, unaware of his title, to help her find her fiancé. Curious and unable to resist, Nathan accepts her offer, keeping his true identity a secret, never dreaming of what the future held for him.

Peggy Serrano couldn’t wait for her best friend to come home from the war. But the Jimmy Barnett who returns is much different from the Jimmy who left, changed so drastically by his experience as a medic in Europe that he can barely function. When he attempts the unthinkable, his parents check him into the VA hospital. Peggy determines to help the Barnetts unravel what might have happened to send their son over the edge. She starts by contacting Jimmy’s war buddies, trying to identify the mysterious woman in the photo they find in Jimmy’s belongings.

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.

Despite the fact that her daughter is not cooperating, Caroline, Duchess of Riverton, is determined to ensure every one of her children marries someone they love as much as she loved their late father. William, the widowered Earl of Blackstone, is delighted to have his days of escorting daughters approaching an end.

He’s not looking for trouble. All former spy and current national security agent York Newgate wants is to propose to the woman he loves, RJ Marshall. Then they can move to Shelly, Washington, and start the calm, safe life he’s been dreaming of for over a year. Too bad trouble doesn’t agree. Or maybe RJ simply attracts trouble because she’s just going out for coffee when she spots a wanted, known terrorist standing in the middle of a street in Paris. At least she thinks it’s international criminal Alan Martin. But he’s in jail, right? Wrong. Martin has escaped.

Beauty has been nothing but a curse to Penelope Snow. When she becomes a personal maid for a famous actress whose troupe is leaving Chicago to tour the West, she hides her figure beneath shapeless dresses and keeps her head down. But she still manages to attract the wrong attention, leaving her prospects in tatters—and her jealous mistress plotting her demise.

At the age of nineteen, Lady Dorothea Rowlandson was practically on the shelf. Had she not suffered her father, the earl’s, untimely death weeks before last year’s season, she would surely by now be a married lady—the established wife of an illustrious peer. With such a regrettable delay, time was ever more of the essence if she wished to secure her own future and that of her sisters.

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.

Artistic expression is both Carter Anderson’s safe space and his livelihood, but his fading inspiration has him worried about his place in life. His encounters with Emma spark a passion to create that he hasn’t felt in years and he isn’t ready to let go of his new muse even if she’s threatening the sanctity of his art world with her digital technologies. As each tries to gain an advantage from the other, Emma and Carter discover they actually might be more compatible than they thought.

With their sharp engineering minds, Laura Stiles and her two sisters have been able to deal with their mother’s unfortunate choice in husband until they discovered his plans to marry each of them off to his lecherous friends. Now they must run away - far and fast - to find better matches to legally claim their portion of their father's lumber dynasty and seize control from their stepfather.   

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.

Haunted by the horrors of war, ex-cavalry officer Matthew Hanger leads a band of mercenaries known as Hanger's Horsemen who have become legends in 1890s Texas. They defend the innocent and obtain justice for the oppressed. But when a rustler's bullet leaves one of them at death's door, they're the ones in need of saving. Dr. Josephine Burkett is used to men taking one look at her skirts and discounting her medical skills. What she's not used to is having a man change his mind in a heartbeat and offer to assist her in surgery.