A Rogue to Ruin by Darcy Burke

Anne Pemberton was one of the Season’s most popular young misses until her betrothed was arrested for extortion at their wedding. Now a social pariah, she can’t help but think back to the dashing gentleman she met before the Season started. Though they spent several afternoons exploring East London together, they never disclosed their names. They did, however, share a kiss, and Anne can’t forget it—or him.
Former thief Rafe Blackwell is now a respectable gentleman with one goal: to take down the man who murdered his parents. Reunited with Anne, their attraction still blazes strong, and he can’t let her get too close, for his heart is forever cold and his mission too desperate. But when Anne seeks to save him—both emotionally and physically—he’ll have to embrace the darkness or risk losing the only light he’s ever known.