The Lady’s Great Escape by Allison B. Hanson

She was an uninvited guest, with a heart he couldn’t let go.

Shaemus Buchanan preferred being alone. He had secrets to protect and isolation was his respite from his carefully constructed reputation. But then he finds Thea Rockledge in his guest house and despite his good judgment, can’t turn her away.
Running from her brother, Thea made her way to Scotland, seeking refuge in an empty castle. She only needs a few months to finish her novel, and she’ll have enough to buy her own home, untouched by untrustworthy brothers with addictions. But when the lord of the manor she’s secretly staying in catches her on his property, can Thea put aside her fears and rely on him?

When trouble closes in, they are forced to take extreme measures to guarantee her protection. But when she learns Shay isn’t who she thought he was, will she run again or stay and fight?