The King's General - Daphne du Maurier

On her eighteenth birthday, Honor Harris meets Sir Richard Grenvile: he is proud, reckless – and utterly captivating. They have a rare connection, and with her beauty and sharp wit, she intrigues him too. But days before their wedding, tragedy strikes and Honor must reconcile herself to a life alone. Fifteen years later, war forces Honor to shelter with her sister at the Cornish estate of Menabilly. There, she meets Richard, who has risen through the ranks to become a general in the king’s army. With all of England in turmoil, Honor must draw on her courage to save Richard’s life and defend her country.