This was an interesting book if you look at it as a guide for young people to look forward to a peaceful world by learning the rules of being peaceful within themselves.
Obviously, the sci-fi loving part of me really enjoyed the story as Sherpa made time hops. The history buff loved the different people Sherpa met during her hops. Last but not least, "good prevails over evil" is always a winning concept for me when I am reading!
I recommend this book for readers age 12 through 18 who enjoy adventure and time travel.