Affair introduces Charlotte Arkendale, an industrious young woman who provides a very special service. Wealthy women hire her to check the qualifications of their suitors. When one of Charlotte’s loveliest clients is murdered, she hires the darkly handsome Baxter St. Ives to be her assistant and bodyguard. But as they pool their powers of deduction and begin to investigate the mysterious circumstances surrounding the murder, they also uncover the force of a powerful, and mutual, chemistry.

Venetia Milton's memories of a romantic night with Gabriel Jones—an alchemist's descendant—are shattered soon thereafter by news of his death. Adopting the guise of his respectable widow, she embarks on a new career as a fashionable photographer in London, where her unique ability to "see" beyond her subjects makes her photographs highly prized. But Venetia's romantic whim causes unexpected trouble.

At five and 20, Prudence Merryweather knew very well the risks a woman took by visiting a gentleman in the dead of night. But bearding the notorious Earl of Angelstone in his den was the only way to stop him from engaging her hot-headed brother in a duel. And that was why she found herself ushered into Sebastian's forbidding presence at three in the morning - and thoroughly kissed before dawn.

There was no doubt about it. What Miss Harriet Pomeroy needed was a man. Someone powerful and clever who could help her rout the unscrupulous thieves who were using her beloved caves to hide their loot. But when Harriet summoned Gideon Westbrook Viscount St. Justin to her aid, she could not know that she was summoning the devil himself.

When a blackmailer threatens her Aunt Zoe, Iphiginia knows she can ferret out the villain. A 26-year-old vixen with the intellect to match her beauty, Iphiginia descends on London society as the dazzling mistress of the missing Earl of Masters—another supposed victim of the blackmailer. But when the missing earl suddenly reappears at a ball, Iphiginia is caught in her own clever lie.