The Writer and the Rogue by Lydia Drake

Desperate times call for drastic measures…and Miss Caroline Devereux is most certainly desperate. Her spendthrift father’s been gambling away every spare shilling, racking up debts, selling off their family’s coveted objets d’art, and bringing them to the edge of ruin. Up until now, she’s been able to stave off the creditors—and afford luxuries like tea—by penning sensational Gothic tales. But they’re out of time, and Caroline must play the one card she has left.
The Earl of Rockford cannot believe that any young lady would dare to blackmail him. Not only has she threatened to expose the darkest secrets of his family and destroy their name, but she’s done it all in an attempt to…marry him? And damned if he isn’t secretly delighted by her spirit. But first, Miss Caroline has a lesson to learn about who she’s dealing with…
No one warned Caroline that the handsome, wealthy earl she intends to marry isn’t remotely the gentleman she expected. Because the “Rogue of Whitechapel” isn’t about to go down without a fight…and the first to fall in love will be the first one to lose.