Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Even the author couldn't keep the story straight

This books starts off good, but even the author gets confused with all the time travel going on. The bottom line is...if Lucy and Jamie were Sara's great-grandchildren, then they could not possibly have existed at the same time that Sara's grave existed...This is only one of the several inconsistencies in the book. The book would've been much better if the author could have kept up with the story line.