The Wicked Viscount by Heather McCollum

1685, Scottish Highlands
Cat Campbell knows all about Nathaniel Worthington, fifth Viscount of Lincolnshire. The determined Englishman is never far from Finlarig Castle, where his sisters train women to do more than read and write. And thanks to the fiery kiss they shared nearly a year ago he is never far from her thoughts. No one ever trained her how to forget an irresistible man.
Nathaniel knows he should keep his distance from the fierce Scottish lass, but when an urgent letter from Queen Catherine calls Cat to London, he can’t resist volunteering to escort her. The tension between the two has simmered for months, but the long journey in close quarters creates a raging wildfire that could burn them both.
Secrets of their past and the treachery lurking at court put both their future together and their very lives at risk.