Stumbled across this title, thought I'd give it a go. It tells the tale of Katherina Ferguson, who is touring England, and visits an old castle on a ghost tour with her aunt. There is a strange cosmic arrangement which transports her back in time to the 17th Century, when Charles and Cromwell are at odds in England. She meets the Lord of the Castle, Kane, who is, naturally drop-dead gorgeous (cover pic tells you this bigtime). They end up together, but meanwhile his cousin has transported to the 20th Century, but we don't hear too much about him, don't worry....
Katherina is a herbalist, who manages to cure the ills of the local peasants. There is a sub-text involving the hideously deformed brother of Kane, who falls in love with a local maiden who is blind (whew, that's handy). Accusations of witchcraft fly through the air, there is some steamy outdoor action, and you are left wondering if the time travel will be reversed or not.....
Despite the very cheesy cover, I actually found this book very entertaining, certainly amused me for a couple of nights. Go Cordelia!