The Reluctant Duchess, Ladies of the Manor Series by Roseanna M. White and published by Bethany House Publishing.
Lady Rowena Kinnaird may be the heiress to a Highland earldom, but she has never felt good enough--not for her father, not for the man she thought she'd marry, not for God. But after a shocking attack, she's willing to be forever an outcast if it means escaping Loch Morar.
Brice Myerston, the Duke of Nottingham, has found himself in possession of a rare treasure his enemies are prepared to kill for. While Brice has never been one to shy away from manor-born ladies, the last thing he needs is the distraction of Lady Rowena, who finds herself in a desperate situation. But when Rowena's father tries to trap Brice into marrying his daughter, Brice makes a surprising decision.
Rowena wanted to escape the Highlands, but she's reluctant to marry a notorious flirt. And when she learns that Brice is mixed up in questionable business with a stolen treasure, she fears she's about to end up directly in the path of everything she was trying to avoid.