Name of a historical romance novel
I need the name of a historical romance novel possibly from 80s or 90s. It is about a young russian girl whose marriage is arranged to a man that she thinks she is in love with. But, he actually is just a stand-in for his brother. He brings her by ship to his brother. When they arrive and he finds out that he is married to her he is mad that she is so young and not cut out for ranch life. He brings her on a cattle drive and eventually, they fall in love. Please help! Thanks.