This book is nothing special. There is a gloss of the history of Sabbath. There are recipes, songs, prayers, and a Sabbath meal guide. Overall, if you have a few hours give it a read. If not, leave it at the bookstore.
This is a quick layman's study on the practice and the purpose of Sabbath in Jewish culture. It is a fast read that really gives you a great perspective on the why and the how o a sacred tradition that is centuries old.