Emphasis here is on symmetries.
I was expecting something along the lines of an updated Lanczos (The Variational Principles of Mechanics). But the emphasis here is very much on relativistic symmetries. Actually the book reminds me somewhat of Penrose's _Road to Reality_ and -- perhaps a better comparison -- Longair's _Theoretical Concepts in Physics_, with a mix of popular and semi-popular exposition, historical background, and more detailed mathematical exposition, but with a focus on relativistic symmetry (which still allows for a pretty wide-ranging number of topics in physics).One complaint: the paper, printing and artwork are rather poor for a $45 paperback. Oxford and Cambridge Press, for example, produce much higher quality paperbacks in this price range. I've knocked off a star for that.