" Marks was so self-contained and tenacious that it was often easy to forget she was still a young woman in her early twenties. When Leo had first met her, she had been the perfect embodiment of a dried-up spinster, with her spectacles and forbidding scowl and her stern hyphen of a mouth. Her spine was unbending as a fireplace poker, and her hair, the dull brown of apple moths, was always pinned back too tightly. The Grim Reaper, Leo had nicknamed her, despite the objections of the family.
But the past year had wrought a remarkable change in Marks. She had filled out, her body slender but no longer matchstick thin, and her cheeks had gained color. A week and a half ago, when Leo had arrived from London, he had been absolutely astonished to see Marks with light golden locks. Apparently she had been dyeing her hair for years, but after an error on the part of the apothecary, she had been forced to abandon the disguise. And whereas the darker brown locks had been too severe for her delicate features and pale skin, her own natural blond was stunning.
Which had left Leo to grapple with the fact that Catherine Marks, his mortal enemy, was a beauty. It wasn't really the altered hair color that made her look so different... it was more that Marks was so uncomfortable without it. She felt vulnerable, and it showed. As a result, Leo wanted to strip away more layers, literal and physical. He wanted to know her. "

― Lisa Kleypas , Married by Morning (The Hathaways, #4)