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.

A scandalous book by an anonymous author takes London by storm, and everyone is convinced its villainous “Lord K” is the greatly admired Earl of Knightly. Heartbroken that he left her at the altar, Miss Regina Leyland impulsively sought revenge by revealing the true Knightly to the world but never expected the uproar to bring enemies to her door. To keep her identity hidden, she must trust the one man with the power to destroy her.

Miss Cleopatra Lewis is about to be launched in society by her aristocratic grandfather. But since she has no intention of marrying, she visits a costume emporium specifically to order unflattering dresses guaranteed to put off any prospective suitors. Powerful and charismatic Jacob Astor Addison is in London, acquiring businesses to add to his theatrical holdings in America—as well as buying an emerald for a young lady back in Boston. He’s furious when a she-devil masquerading as an English lady steals Quimby’s Costume Emporium from under his nose.

Born into an aristocratic family, yearning for a life beyond Society’s strictures, Marguerite “Daisy” Townsend is an enterprising sleuth. Hired to obtain proof of a wife’s infidelity, she secures a position in the household of the woman’s lover, never expecting to be lured into the seductive blackguard’s arms herself. Devilishly handsome, David Blackwood, known widely as Bishop, quickly realizes the enticing maid is interested in far more than dusting. She aims to uncover his sins. Although tempted by the dangerous beauty, he can’t risk her learning the truth.

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.

Evie Harlow is quite content running the quaint little bookshop she inherited from her father…or so she convinces herself anyway. It might not bring in much money, it's not very exciting, and it's not a very good way to meet eligible men, but Evie's always thought she was destined for spinsterhood, a dull life, and hard work.

England, 1865: Newspaper columnist Lady Katherine Bascomb finds herself the subject of speculation when her latest article leads to an arrest in the murders plaguing London. The English believe women ought not to write about such vulgar things as crime, and a particularly attractive detective inspector is incensed that she's interfered with his investigation. To escape her sudden notoriety, Katherine heads to the country - only to witness a murder upon her arrival.

Lady Grace Wyatt is content as a wallflower, focusing on scientific pursuits rather than the complications of society matches. But when a handsome, celebrated naturalist returns from abroad, Grace wishes, for once, to be noticed. Her solution: to “build” the perfect man, who will court her publicly and help her catch his eye. Grace’s colleague, anthropologist Sebastian Holloway, is just the blank slate she requires. To further his own research on English society, Sebastian agrees to let Grace transform him from a bespectacled, bookish academic into a dashing - albeit fake - rake.

Lady Honora Parker must get engaged as soon as possible, and only a particular type of man will do. Nora seeks a mate so abhorrent, so completely unacceptable, that her father will reject the match—leaving her free to marry the artist she loves. Who then is the most appalling man in Manhattan? The wealthy, devilishly handsome financier, Julius Hatcher, of course….

Lord Lysander Blackstone, the stern Duke of Montcroix, has only one interest: increasing his considerable fortune. After a series of betrayals, he keeps his emotions buried deep. Money, after all, can't break a man's heart—or make promises it can’t keep. But when his reputation for being heartless jeopardizes a new business deal, he finds himself seeking a most unusual—and alluring—solution.

Delilah Swanpoole, countess of Derring, learns the hard way that her husband, “Dear Dull Derring”, is a lot more interesting - and perfidious - dead than alive. It’s a devil of an inheritance, but in the grand ruins of the one building Derring left her are the seeds of her liberation. And she vows never again to place herself at the mercy of a man. But battle-hardened Captain Tristan Hardy is nothing if not merciless.

Joanna Porter loves being one of London's hottest up-and-coming matchmakers. But her heavenly vocation is about to turn into a nuptial nightmare—thanks to the Duke of Crestmont. He's as handsome as he is insufferable and obsessed with all things proper. Matching him would cement Jo's status as England's greatest matchmaker. Except, of course, the impossible-to-please duke refuses all of her most eligible ladies...confirming his status as a complete and utter pain in her petticoats.

Miss Wilhelmina "Mina" Crawford is desperate. Having been ruined in the eyes of society years ago for one foolish, starry-eyed mistake, she spends her days secreted away at her family's crumbling estate, helping her brother manage the land but not able to truly live life the way she's always dreamed. When her brother admits to just how dire their finances have gotten, she takes it upon herself to procure employment . . . but the only one who will even consider the scandalous idea of a female secretary is the brilliant, ruthless, and infuriating Earl of Creswick.

Joan Bennett is a breath away from being a spinster. She’s had four seasons without a suitor. After reading a shockingly sensuous book, Fifty Ways to Sin, Joan decides perhaps it’s time to stop being proper and start being sinful, while she’s still young enough to enjoy it. And what better partner than her brother’s drinking mate, Viscount Burke? He seems the type to know how to give a lady a lascivious adventure.

Maddie Montgomery’s family is in debt, and her hope rests on the rival Davies clan missing their yearly “pledge of goodwill", ceding the land that separates their estates. With Maddie’s teenage nemesis, Gryffud “Gryff” Davies, Earl of Powys, away, hope is in reach. But then Gryff shows up on a horse and is stunned that the tomboy he once teased is now a woman. When Gryff and Maddie discover contraband on their land, they realize it can benefit both families. But they’ve also uncovered a dangerous plot....