Struggling to support her family after her husband’s death, Caroline Harding attracts the attention of the ruthless Captain Francis Grafton who offers her a devil’s bargain to pay back her debts to him. Outwitting her enigmatic employer and unwillingly gaining his approval significantly changes her life for the better, but can she win his loyalty and his heart when he appears to care for nothing but profit?

When Miss Elizabeth Waterstone encounters the enigmatic Duke of Diable Delamere in the most shocking of circumstances, she is determined to exploit his rakish expertise to the fullest extent. The duke agrees to teach her everything she needs to know, but in return expects to receive her unwitting cooperation to uncover an assassination plot against the monarchy. But Elizabeth is hard to deceive, and the duke finds himself needing more than her innocent skills in his bed.

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.

Although Celeste Montgomery was forced into a marriage a year ago, her husband is more often gone than home, and she is living a quiet life. Until Investigator Owen Gregory shows up at her home to tell her some outrageous news: Her husband has been murdered...and he was also a bigamist, making her the third of three wives.

Drusilla Clare is full of opinions about why a woman shouldn't marry. But that doesn't stop the rush of desire she feels each time her best friend's brother, notorious rake Gabriel Marlington, crosses her path. So imagine her dismay when she finds herself in the clutches of a scoundrel, only to be rescued by Gabriel himself. And when Gabriel's heartless - and heart-pounding - proposal comes, it's enough to make Dru's formidable resolve crumble...