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.

A dutiful army officer who shuns intimacy. A selfless beauty ready to start living for herself. A chance meeting in the street that leads to love. When Major Spencer Haddock’s father dies, he returns to England as the Earl of Middlefield. He seeks a typical ton marriage, where his wife will provide him with an heir and possibly other children and then they go their separate ways. He intends to find his countess quickly and not waste time at boring social affairs.

As a child, Devlin Ware thought his family stood for all that was right and good in the world. They were kind, gracious, and shared the beauty of Ravenwood, their grand country estate, by hosting lavish parties for the entire countryside. But at 22, he discovered his whole world was an elaborate illusion, and when Devlin publicly called his family to account for it, he was exiled as a traitor. So be it. He enlisted in the fight against Napoleon and didn't look back for six years. But now his father is dead, the Ware family is broken, and as the heir he is being called home.

While her older sister is being presented to London Society for the season, Lydia Bramwell is sent to her Aunt Camilla in the Sussex countryside. High-spirited Lydia expects a very dull visit, but her sojourn to the village of Diddlington is not as idyllic as she anticipates . . . A charred and bludgeoned corpse is found in the woods, and suspicion falls on Lydia's aunt's suitor, an intriguing Frenchman. Convinced of his innocence, Lydia enlists the help of her new friend, John Savidge, to catch the real killer.

Miss Dinah Ashmore has a problem: her sister has gone missing, and the constable isn’t taking it seriously. She decides to take matters into her own hands by hiring a Bow Street Runner, not understanding the danger she has put herself in. Nathaniel Calvert, Earl of Hawthorne, is an agent of the Crown. His assignment is to root out a radical group and bring them to justice. When Miss Ashmore mistakes him as a Bow Street Runner and explains her plight, he suspects that the missing sister might be connected to his case.

The Earl of Wrexford possesses a brilliant scientific mind, but boredom and pride lead him to reckless behavior. He does not suffer fools gladly. So when pompous, pious Reverend Josiah Holworthy publicly condemns him for debauchery, Wrexford unsheathes his rapier-sharp wit and strikes back. As their war of words escalates, London's most popular satirical cartoonist, A. J. Quill, skewers them both.

He's a master of disguises...but he can't mask true love. Spymaster Harry Harmon's new assignment is to spy on enemies at a country house party. To do that, he'll require a courtesan: learned, truthful, and beautiful.... Poor, sensible, smart Simone Ryland has come to Mrs. Burton's bawdy house in search of work. But instead, she finds Harmon in need of her special skills.

Trevor Hunt, the Duke of Ridgely, has been called many things, most of which are true. Reviled by his family, hated by many, he's earned his reputation in the seedy streets of London and more than his fair share of bedchambers. But battling deadly foes and irate husbands failed to prepare the duke for the most troublesome role he's played yet: guardian to one maddening hoyden.

Daughter of an earl, Lady Hildegard Templeton hasn't conformed to what society expects from a woman of her station. Industrious and unique, she's created an emboldened organization for women on the cusp of marriage, The Duchess Society. Called a bluestocking to her face and worse behind closed salon doors, she vows to marry for love. And nothing but. Although the emotion has yet to show itself to her. Until she meets him.

Eighteen-year-old orphan Harriet Thomson has resided with a distant cousin’s aristocratic household since the age of five, first as companion to Prudence, the youngest daughter of house, later as carer of Pru’s ailing father. When he dies, she has to make her own way in the world and finds work as companion to the elderly Countess Arden, who resides in the Dower House on the Hertfordshire estate of the dashingly handsome Duke of Fairbridge.

Following the death of her husband, Lady Darby has taken refuge at her sister's estate, finding solace in her passion for painting. But when one of the house guests is murdered, her brother-in-law asks her to aid the insufferable Sebastian Gage - a fellow guest with some experience as an inquiry agent. While Gage is clearly more competent than she first assumed, Kiera isn't about to let her guard down, as accusations and rumors swirl.

As the eldest son of the Duke of Langford, Nathaniel Gresham sees his arranged marriage to Lady Violet Devere as just another obligation to fulfil – highly suitable, if unexciting. But as Violet sets out to transform herself from dowdy wallflower to dazzling young duchess-to-be, proper Nathaniel sets out to prove he's a match for his new bride's vivacity and daring.

Tabitha, Lady Chesterton, the Countess of Pembroke, is newly widowed at only 22 years of age. With no son to inherit the title, it falls to a dashing, distant cousin of her husband's, Jeremy Chesterton, known as Wolf. It quickly becomes apparent that Wolf had consorted with some of London's most dangerous citizens before inheriting the title. Can he leave this world behind, or will shadowy figures from his past follow him into his new aristocratic life in Mayfair? And can Tabitha avoid being caught up in Wolf's dubious activities?

Determined to locate a kidnapped dog, Michael Bromley, Duke of Woriton, isn’t thrilled to be saddled with a flighty female insisting on helping, except that Bitsy has a great deal more sense than he expected—and a sharp tongue to match. Still, what’s a scientist to do but continue to pursue an outcome, however unexpected it may be? But chemistry is all about attraction, and this is one formula with some hilariously romantic results.

With her headful of wild curls and wilder ideas and an unabashed love of experiments and explosives, society has labeled Lady Imogen Loveless peculiar…and doesn’t know she’s one of the Hell’s Belles—a group of vigilantes operating outside the notice of most of London.