When the Earl of Rancliffe suffers humiliation at the hands of the mysterious Mademoiselle Noire, he vows revenge. But his anger soon becomes obsession, as she leads him into ever more dangerous games. As cruel as she is beautiful, Mademoiselle Noire has no intention of revealing her true identity, nor of entangling her heart.

Rumors abound about the rakish Viscount Rochford, a man who’s left a trail of wailing hearts in his wake. With a reputation for jilting society women, the ton can scarcely believe he is ready to settle down and wed. Neither can Miss Penelope Stratton. With her enviable looks and sizable dowry, this shy country girl finds herself with an impressive list of suitors. Yet against all her better judgment, she is drawn to the one man least suited to matrimony; a notorious man with a scandalous past.

Spirited debutante Lady Olivia McLeod, cherished daughter of the Duke and Duchess of Strathaven, has two interests: solving mysteries and winning the love of her rescuer and secret crush, the infamous Duke of Hadleigh. When Livy joins Lady Charlotte Fayne's charity for young ladies and discovers that it is a front for a covert investigative agency, she is thrilled. Livy dedicates herself to solving a deadly case. Little does she realize that the path to danger will also lead to her heart's deepest desire.

In the service of England's spymaster (well, his niece, but surely he'll appreciate the help), Miss Mary Wilson is on a mission to uncover a treasonous plot. Though her only clue leads to the debaucherous secret society of the marquess of Hartford, a lifetime of being overlooked should ensure her access to all of the gossip her assignment will require. There's just one problem: Mary is due to find a husband this season, and her aunt Elizabeth, the Viscountess Hood, is determined to see her niece shine bright.

The widowed Duke of Averell is trying to be a better man...But when he spies a young woman, reading the Iliad beneath a tree, no less, Marcus forgets all his good intentions. Miss Weatherly is outspoken, intelligent, and enamored with the ancient Greeks. When she brazenly offers to show him the constellations later that night, Marcus readily agrees. Unfortunately, Miss Weatherly is not the woman Marcus has come to Halloway Park to offer for.