The Duchess Gambit by Patricia Haverton

Behind the mask of ice that people wear, there beats a heart on fire…

Rudolph Yardley, valet to the Duke of Upton, hides a dangerous secret.
His real name is Sue and he’s not by any means a man. After her family’s tragic death from a fire, Sure had but one choice in order to survive: disguise herself as a man and take her later brother’s place in the Duke’s employ.
Vernon Wade, Duke of Upton, feels lost after his father’s passing. Already struggling with his newfound responsibilities, his carefully constructed mask of composure crumbles when he comes across a shocking sight: his very own valet is in fact, a beautiful young woman.
Lost in their budding feelings for each other, Sue and Vernon fail to see the viper in their midst. When a fire breaks out, a face emerges through the flames. A face that has been haunting her nightmares all her life.