The Scottish Siren by Kirsten Osbourne

Beth has spent her entire life alone. Orphaned at a young age, she bounced around the foster care system until she was old enough to be on her own. When a strange woman approaches her in her book club, she goes to lunch with her, never expecting anything more from it than a fun lunch. Beth explains her intense desire to live out one of the historical Scottish novels she reads, and finds herself in a different place and time.
When Gavin McClain stumbles on a beautiful woman on his way back to his clan, he stops to help her, ignoring the fact that she is dressed in horribly inappropriate clothing. After talking to her for a short while, he believes her claims that she came from the future and a land across the seas. Knowing the only way he can protect her is to marry her, he offers her his name. Will Beth learn to exist in the past with no indoor plumbing? Or will their marriage be doomed from the start?