Lady Of The West by Linda Howard 378 p.

Frank McLain thinks he will have everything he has ever wanted if he can marry a true lady. He virtually buys a southern lady from her family who has suffered terrible loses after the war. He is a ruthless man and Victoria Waverly can hardly stand to be his wife. What she doesn't know, is that Jake and Ben Sarratt are coming to revenge their parents killing at McLain's hand.

She and Jake fall in love but there are many twists and turns before we find the happy ending.