The King's Lady by Lietha Wards

Kate Purnell was a young sophisticated woman. Until he died of a heart attack, she was raised by her father in a bustling city. She now had to move and live with her cousins in the wild lands of southern California.

She expected something different, of course, perhaps a bit frightening and a maybe thrilling, but nothing could have prepared her for Everett King, a hunk of handsome cowboy. As soon as she set eyes on him she was totally captivated. Everett was a character you only read about in the adventure section of a magazine. She couldn't imagine men like him actually existed. But he did! And he had some interesting ideas of his own.