"A Tom Doherty Associates book."

"Robyn Stafford, a young American woman executive, has flown from Hollywood to England to surprise her lover on his birthday, only to find that he's married and his wife's giving the party. So she takes a few days off to recover from her outrage and dismay, traveling and hiking in England near the Welsh border. There she encounters a young man on horseback, wearing a sword, chain mail, and a surcoat, who identifies himself as Edward Plantagenet, Earl of March, and asks directions to a nearby abbey. He thinks it is the year 1459, is amazed by her working cell phone, and invites her to ride along, although at first he thought her a young boy wearing pants! Then his pursuers show up, and Edward and Robyn ride madly across the hills until he drops her off and gallops back to face his enemies. After he fights them off, he returns and invites her to come with him and be his lady. Then he rides away, into the distant past, to the age of the War of the Roses. And so Robyn Stafford must find a way to leave the world of today for the fifteenth century, where she will fall in love with a young knight, a prince who will be king. This is the first of three books in a sweeping historical romance"