If you are interested in the minute details of who-did-what-first in the evolution of the Standard Model, and you really care about who got Nobel prizes and who did not but really deserved to, then this is the book for you. I don't care about either very much, so a good part of this book was a waste of my time.
The descriptions of basic physics models is always very challenging, and Close tries to do a good job of it. He does manage to get across a lot about how fundamental particles behave, but the various theories he discusses are just names, with no substantive content. I know that in mathematics, there are many areas that simply cannot be explained to the non-mathematical layperson, and that may be true of modern physics as well. However, in other fields that I know (population biology and economics, for instance) the important stuff can be fully explained with only the most minimal use of mathematical formalism. I am searching for a popular account of the Standard Model with this attractive feature.