Catherine Meets the Highlander by Rebecca Preston

When Catherine steps through the door of a mysterious professor’s home, she doesn’t expect to wake up centuries in the past—or to find herself caught between two men vying for her heart…

A history doctoral candidate studying the Donald-Campbell conflict on Islay, Catherine is no stranger to tales of Fae magic and feuding clans. But when she’s transported to the heart of the conflict she once studied, she quickly learns that surviving the past is far more challenging than reading about it.
Rescued by Eamon MacDonald, a skilled archer and scout for Clan Donald, Catherine begins to adapt to life at the rugged Fort Donald. Eamon’s kindness and bravery ignite a spark between them, but her presence also attracts the attention of the sophisticated and manipulative Sir Kellan Campbell, who has his own reasons for pursuing her.