This is book one in a series. I really enjoyed this book. Befitting 2015, Yesterday has a “Back to the future” plot line with multiple twist and turns that will keep you turning pages to find out what happens next. It is not psy-fi enough for true afficionados of the genre, but enough to tweak the curiosity of those not usually so inclined. Wrap that into a light romance and courtship based on traditional Christian values and you have a good idea what to expect.