Wish of a Highlander by Katy Baker

Ava Hall prides herself on her independence. Having learned the hard way that emotional attachments only bring you pain, she’s determined to go it alone. She doesn’t need a man in her life. She doesn’t need anyone. But all that changes when a chance meeting with a strange old woman sends her to fifteenth century Scotland—and into a whole heap of trouble.
Saved from an angry mob by a dashing stranger who promptly disappears, Ava is determined to figure out what’s happened to her and find a way home. She’s sure her handsome saviour knows more than he’s letting on—if only she can find him.
Brayden Sutherland can’t afford distractions. On a secret mission for his order, he lives on his wits, keeping one step ahead of his enemies. But when a beautiful woman claiming to be from the future bursts into his life, distraction is exactly what he gets. She’s bold, daring, unlike any woman he’s ever met, and stirs something in him that he thought long dead.
As Ava and Brayden find themselves embroiled in a deadly game, they begin to realize it’s more than just chance that’s brought them together. They each hold a clue that might help them untangle a centuries-old conspiracy and—if they let it—heal each other’s hearts.