Proven By The Highlander by Rebecca Preston

When museum tour guide Mary Cahill wakes up in a strange world after a fatal bank robbery, she finds herself trapped in the body of a goblin and embroiled in a magical conspiracy…

The Sidhe of Loch Ness had good intentions—rescuing time-lost women to create bonds with the Clan. But Mary’s arrival is sabotaged by a vengeful goblin witch, Nellie Sharpfingers, who steals Mary’s human form to infiltrate the Grant Clan and enact a dark plan. Stuck in the unsettling body of her enemy, Mary must rely on the skeptical yet steadfast Watchman Hamish Grant to help her navigate this new reality.
Hamish, a seasoned guard with a sharp eye and a quick wit, doesn’t expect to find himself enchanted by the fiery woman trapped in a goblin’s guise. As Mary struggles to adapt to her dual existence—human by day, goblin by night—her growing bond with Hamish sparks hope and unexpected passion.
When Nellie’s plot threatens the entire Grant Clan, Mary and Hamish must combine her newfound magical abilities with his cunning and combat skills to thwart her schemes. But as they battle to save the Clan, Mary also fights to reclaim her humanity—and the chance for a future with the man who’s stolen her heart.