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.

Focused on finding the perfect bride this Season, the Marquess of Hartford, known to his friends as Rex, finds himself distracted by the quiet Miss Wilson as she continually turns up everywhere she shouldn’t be. As Rex considers the misbehaving Miss Wilson, a curious thought occurs to him. Is it possible that she could be the kind of bride who would enjoy life by his side and the pursuits of the Society of Sin?