Separated By Time - Book Three of The Thistle & Hive Series - The Thistle & Hive, #3

A vision of disaster has Edna Campbell sending her niece, Maggie MacKinnon, a fledgling witch, back in time to sixteenth century Scotland in an attempt to save the MacKenzie clan and to face a mirror image of herself in the form of an evil witch named Brielle. Disguised as a young lad and accompanied by her Uncle Angus, Maggie must prevail in this life and death chess match of witch versus witch. There is much at stake, including the fate of her budding relationship with Dylan Sinclair, her future as a witch and the very existence of the bridge through time.
Dylan Sinclair is on the adventure of a lifetime, having travelled back in time to Medieval Scotland. Handsome and charming, he is a magnet for women, but the only one he's interested in is back in twenty first century Glendaloch, or so he thinks. Brielle, disguised as Maggie, arrives at Breaghacraig, much to Dylan's surprise and confusion, as he realizes she is very different from the girl he thought he was falling in love with.
Not one to give up on his first chance at real love, Dylan sets about trying to solve the puzzle that Maggie has become.