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.

Newly returned from finishing school, Lady Juliette Thorndike is ready to debut in London society. Due to her years away, she hasn't spent much time with her parents, and sees them only as the flighty, dilettante couple the other nobles love. But when they disappear, she discovers she never really knew them at all. They've been living double lives as government spies-and they're only the latest in a long history of espionage that is the family's legacy.

Rowley Knight, Duke of Knighton, is too busy being a duke to bother with such nonsense as love. With three heirs, he is in no hurry whatsoever to succumb to the lures of the leg-shackles. He is content managing his siblings and estates, and avoiding society whenever possible. If he can only find someone to manage his young sister, life can go back to its proper order.

At the end of his Grand Tour, somewhere between Athens and Constantinople, Christian Selwyn, the young Earl of Hazelmere, vanished—seemingly without trace. Time passes. In London, his uncle and cousin move into his home, while his unofficial fiancée, Sophia, is left desolate and in limbo.

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.

Miss Amelia Stalwood may live in London at her absent guardian's townhouse, but she's never actually met any nobility; instead of aristocrats, her closest friends are servants. Quite by happenstance, she's introduced to the Hawthorne family and their close family friend, Anthony, the reformed Marquis of Raebourne. They welcome her into their world, but just as she's beginning to gain some confidence and even suspect that she may have caught Anthony's eye, she's blindsided by an unexpected twist in her situation accompanied by nasty rumors.

Caroline Clapham isn’t a world renowned artist—she’s simply a farmer’s daughter possessed of natural talent with a paintbrush. Talent that her mentor, the Countess of Inglewood, is happy to foster for a summer at her beautiful seaside estate. Caroline wants to see the world and commit its beauties to canvas, but she fears that the season will end and she will return home as insignificant as ever. The lure of an adventure and the enchanting Inglewood estate keep her dreams alive, but when she meets Edward Everly and agrees to fake a courtship with him, those dreams begin to change.

Gregory Dinard, a young and inexperienced duke, finds himself in need of a companion to help him navigate the intricacies of his new role. Uncertain of his abilities and unwilling to take a chance at love, he looks for a marriage of mutual benefit rather than a match of mutual affection.

After years of escaping etiquette lessons in favor of the stables, Christine Devon's grand debut in London is only weeks away, though her deportment lacks the sophisticated polish she needs to achieve her goals of a lofty marriage. Desperate to take her place in society, she needs someone to instruct her in proper behavior. Thomas Gilbert, newly returned from Italy, is ready to begin his dream of founding a horse farm. But during his time away, the estate's finances have dwindled to almost nothing. A chance meeting between them may solve both their problems.

As a once happily married woman, Rebecca Parker lived a charmed life, but now widowed and working for a living, she feels alone and lives a mundane existence. That is until the day a valet speeding by on a horse nearly runs her off the road. Mr. Malcolm Henry is apologetic, gentle, and very handsome. She’s instantly drawn to him, which is why, rather than stopping him from kissing her, she finds herself kissing him back, reigniting a nearly forgotten passion in her. But love at first sight only happens in fairy tales—never to an ordinary woman like her.

Margaret Easton needs a husband, and she needs one now. Her parents are convinced that only a European will do, but Margaret wants nothing more than to stay in England. The trouble is that there is only one man Margaret can think of, or rather, one she cannot forget, and he wouldn’t do as a husband at all. Then she finds herself in his care unexpectedly, and her hunt becomes even more complicated than she could have ever imagined.

Rosalind Newbury is counting down the days until her wedding to the Duke of Marlow, a man she has only met twice. The marriage is more an agreement between two families and less a romantic connection between two hearts, but Rosalind becoming a duchess will elevate her family’s status to dizzying heights. And the duke is a kind man who will care for Rosalind, even if he doesn’t love her.

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.

Cassandra Hale grew up knowing little about her parentage, and she had made peace with the fact that she never would. But her world shifts when a shocking deathbed confession reveals a two-year-old letter from Mr. Clark, the master of Briarton Park, with hints to her family's identity. Stung by betrayal, Cassandra travels to the village of Anston only to learn Mr. Clark has since passed away.

Sowerby, England, 1802. Miss Genevieve Wilde—a magistrate’s daughter and independent heiress—is determined to meet life’s challenges all on her own, just as her late-father had taught her. So when her father’s pocket watch is stolen, she will do anything to get it back, especially when the local authorities prove incompetent. Upon reading an advertisement in the paper, she takes a chance and contacts a thief-taker to find the watch. It’s a choice Ginny regrets when former Bow Street officer Jack Travers arrives on her doorstep.