No Longer a Gentleman (The Lost Lords #4)

Grey Sommers, Lord Wyndham, never met a predicament he couldn't charm his way out of. Then a tryst with a government official's wife during a bit of casual espionage in France condemns him to a decade in a dungeon, leaving him a shadow of his former self. Yet his greatest challenge may be the enigmatic spy sent to free his body - the only woman who might heal his soul.

Cassie Fox lost everything in the chaos of revolution, leaving only a determination to help destroy Napoleon's empire through her perilous calling. "Rescuing Grey" is merely one more mission. She hadn't counted on a man with the stark beauty of a ravaged angel, whose desperate courage and vulnerability thaw her frozen heart. But a spy and a lord are divided by an impassable gulf even if they manage to survive one last, terrifying mission...