Swept By The Highlander by Rebecca Preston

After plunging back in time to 16th century Scotland, Elena stumbles into a dangerous mystery that threatens her life as much as the handsome guard captain Brendan threatens her heart…
Elena Cross is one dang good cop. She’s worked hard to establish herself in a male-driven world, but when she walks through a door and ends up in ancient Scotland, she’s forced to face a new reality in a place where women often don’t garner the same respect and the word “witch” is still used an excuse to burn someone at the stake.
Brendan Grant quickly finds himself falling for the feisty, beautiful red-head who came crashing into his world from the future. But when a mysterious illness and then disappearances hit threaten the men of his guard, and all signs point to Elena, he can’t help be wary of the woman who is being accused of being a witch…or worse.
With the clan, and Brendan, looking at her with distrustful eyes, Elena must convince Brandan to trust her, despite how bad things may appear, and use her investigative skills to clear her name.