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.

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.

Declan, the Duke of Banbury, has no interest in ushering Rosalie Hughes, his stepsister, into society. Dumped on him with nowhere else to go, he's determined to rid himself of the headstrong debutante by bestowing on her an obscenely large dowry, making her the most sought after heiress of the Season. But Rosalie isn't about to go along with Declan's plans. Surrounded by fortune hunters, how is she supposed to find a man who truly wants her?

When Kieran Ransome’s latest antics result in a massive scandal, his father issues an ultimatum: find a respectable wife or inherit nothing. But as one of London’s most inveterate scoundrels, Kieran doesn’t know any ladies who fit the bill. Or does he? Celeste Kilburn is a society darling, beloved by influential members of the ton. But keeping a spotless reputation leaves little room for adventure and she longs to escape her gilded cage, especially with her impending engagement to a stuffy earl.

Shopgirl Poppy Fairchurch knows it's pointless fantasizing about the Duke of Autenberry. Still, dreams can't hurt anyone, unlike the carriage Poppy spies bearing down upon the unsuspecting duke. After she pulls him to safety, the duke lapses into a coma, and Poppy is mistaken for his fiancée. But one person isn't fooled: his arrogant and much too handsome half brother, Struan Mackenzie. Soon Poppy isn't sure what she wants more: the fantasy of her duke or the reality of one smoldering Scot who challenges her.