The main line of the whole book is how author's research team discovered different versions of network model: from Random -> Clustering -> Scalefree model -> Modular Scalefree model
It also mentioned a lot of networks in like cellular biology, economic, politics and (my favorite) terrorist group.
Though the book was written in late 90s and could not cover some latest result in network/complexity research, the book is still a worth-reading introduction to this new frontier of science!
By the way, it seems in the footnote under Page 235, the number 2/14 should actually be 2/11, following formular
N(k)/[k!/(k-2)!2!] = 12/(12!/10!2!) = 12/(12x11/2) = 2/11