This is not a book on meditation or Buddhism, though it has certainly been influenced by both.
It is a book with a single thesis: that there is always something you can do, moment by moment, to rediscover.
It is a book about teaching yourself "from the middle" -- the middle of frustration or joy or boredom or wherever else you find yourself.
It is a book of encouragements for all those who are interested in using the unit of a single day to develop good qualities in their minds and hearts.
This is not a book on meditation or Buddhism, though it has certainly been influenced by both