Her Noble Captive by Emily Windsor

HER : Miss Rosalind Trewent. A past that haunts her present.
NOBLE : Major Lucas Mainwaring. A man scarred in mind and body.
CAPTIVE : Can they escape their demons to find a love that began many years before?

Convinced no woman would ever want him, Lucas Mainwaring, the new Earl of Helmdon, now devotes his life to medicine, his work bringing him peace. But the hunt for a killer draws him from London to the peaceful Cheshire countryside and a reunion with the irrepressible Miss Trewent… If only the lady hadn’t previously fainted at the sight of him.
Cursed by dreams and a painful childhood, Rosalind believes no gentleman would ever understand her, let alone love her. Content under the guardianship of her cousin, she fills Stonebridge Hall with colour and laughter, knowing she can never leave… There is just the small matter of apologising to their guest for that fainting incident.

Murder brings them together, passion takes hold, but will their secrets tear them apart.