Basically a Cowboy/Outlaw who is either wanted/condemned/running-out-of-options steals the identity of the man he is travelling with when the man dies. The man is travelling to meet a woman who he is going to marry who he had never met and all the cowboy knows about her is in some of the letters the man was carrying. Unknown to him is that the woman also died and a prostitute in an inn/brothel/do-not-remember decides to take her identity too. Eventually the secret comes out and they fall in love of course.
I do remember that it is a series and that it does have some very christian themes in it. In a later book the woman and cowboy marry and they have twins but I cannot remember any names at all. I think I read it in grade 6 or 7 so a long time ago.
Any help would be much appreciated even if it is just towards a place that might have more answers.
