London, 1812. When the unconventional Gemma Lancaster embarked on a mission to infiltrate high society and avenge her beloved cousin's murder she never would have guessed she'd end up in the arms of a thief. At least, that's what she assumes when she discovers Lucas Stone breaking into a private safe.
Lucas Stone, the Earl of Winchester, has a reputation for arrogance and a soft-spot for his sister, which is how he ends up in the predicament of hiding behind a curtain at midnight with the dreadfully dull Miss Gemma Lancaster. But he soon discovers appearances can be deceiving when the country mouse turns into a spitfire in front of his eyes and she makes it clear she wants nothing to do with him.
Though one is chasing a blackmailer and the other a murderer, they quickly realize they are on the hunt for the same villain. Now they must work together, which would be fine, if they could decide if they'd rather fall in love or kill one another.