Irresistibly Yours, My Lord Marquess by Olivia T. Bennet

She is fire and ice. He fears the cold but craves the burn…

Thieves and brigands hardly scare Miss Sarah Foxter.

To be an active member of the Mohocks, a gang that helps the poor is the only pleasure for the extraordinarily brave and exceedingly reckless daughter of a well known wealthy merchandiser.
Joshua Edington, the Marquess of Manworth and well-known bachelor, has the reputation of being a little bit of a player. Just arrived in Bath, he finds nothing exciting. Until he finds himself bewitched by a woman unlike anyone he has ever met before.

But Sarah’s double life is not the only thorn in their side. Someone knows of their relationship and their disapproval soon turns deadly.
Running from an enemy with no name and no reservations, their only hope lies in a single unexpected clue: Sarah’s peculiar birthmark that throws them back in time to a secret that has been kept under lock and key for decades…