This book was recommended to me by a friend who knew I liked historical fiction and had read it about 30 years ago. While it was a good "beach read" I cannot recommend it as any kind of "real" historical fiction--it is on the cusp(well, maybe over the cusp) of being a bodice-ripper. The characters were pretty predictable (seeming bad guys were really good guys, ones that seemed good turned bad, etc.)and the plot was pretty thin, but it was a quick read and not totally unenjoyable. If you want something for a quick vacation/airplane and don't want anything heavy, this will probably suit your needs.
Basically, the heroine has flashbacks and had a prior life as a lady in the 13th century. Her life there has eerie similarities to her life in the present; many of the characters apparently followed her from that life to this for nefarious purposes. Everything ties up neatly at the end. I've never read any of Barbara Erskine's books before, but I suspect she is of the romance-novel genre.