The Enchantment by Pam Binder
"THE ENCHANTMENT
Conor McCloud returns from the Crusades to discover his cousin has taken possession of Inverness, the McCloud castle. Fighting back to reclaim his family home, Conor makes a promise to a dying friend: seek out the woman who a witch said could heal the land...a woman from another time and place.
Eilan Dougan has taken leave from her Colorado river rafting business to help sell her parents' Seattle antique shop. Her uncanny ability to sense others' thoughts has always set her apart -- and when a dark Highlander appears and begs her help, she can't refuse. But fourteenth-century Scotland is no place for a woman with Eilan's powers. Now instead of Eilan saving Conor, Conor must rescue Eilan from charges of witchcraft -- and decide whether love can withstand the ultimate test of time.