I base my kindle purchases a lot on the reviews, so felt I needed to balance the three 5 star reviews (one of which was from the author).
The idea had potential. That is the reason for the 2 stars, but...
Parts of the book were too long and repetative, pages of the heroine agonising over actions and their consequences, yet other key parts of the story were rushed. The voice changed throughout the book from 1st to the 3rd person, from present to past tense. I felt the book was a bit confused as to whether it was a time travel or a ghost story. I am no expert, but it did seem to me there were historical anomalies of the time period the heroine starts in - she and her sister design and make gold jewelry, they use flint knives, have an oven reminiscent of an aga style oven, are hunter gatherers, and also have spelt wheat. The time period is never defined - just thousands of years ago, perhaps bronze age, but with inconsistencies. One thing I found really hard to believe was that a time traveller from thousands of years ago, could within a few months be comfortable with surfing the internet, driving a car, and then going on to host her own TV show.
Maybe with a good editor this book could be tightened up, and prove to be a good read. I won't be botheing with the sequel, and only finished it as I felt it unfair to write a review of a book I hadn't finished.