The bastard daughter of an underworld crime lord wouldn’t usually be a candidate to deliver vengeance, but she’s never been conventional…

London 1888

Frankie Smith has waited long years to bring her father, a powerful crime lord, to justice after he murdered someone she loved. Now that he’s kidnapped a high-profile heiress, Frankie teams up with the girl’s fiancé to make sure the crime doesn’t go unpunished.

Scientist Thaddeus Bruce, Viscount Caldwell, is on the verge of developing a method to sanitize public water. He’s also flat broke. To finance his research, he’s agreed to marry a sweet-tempered heiress who shares his passion for chemistry. So when a strange woman arrives in his washroom and claims his new fiancée has been kidnapped, he’ll do whatever he must to recover her–even follow this street rat into the St. Giles underworld.

Together, they search for answers and discover secrets that span oceans. But though pursuing criminals proves increasingly dangerous, their greatest risk may be the chemistry between them.