The Earl's Scandalous Wife (Marriage By Scandal #4)
Ruth Ann Nordin

Miss Paula Leighton has to do something before her brother marries her off to a drunk duke who wants nothing more than to use her to get an heir. So when she sees Perry Ambrose, the Lord of Clement, she takes the opportunity to escape, causing a scandal that forces his hand. And the scheme works. She no longer has to marry the duke.
But it's not over. Thanks to her tainted past, her newfound love with Perry is threatened when her brother comes back into her life. Can she protect Perry from finding out the truth or will her brother get the upper hand?