Simon Winchester's love of learning and information is so incredibly infectious that even at his roughest his books do not fail to illuminate and interest. As with KRAKATOA, Winchester in A CRACK AT THE EDGE OF THE WORLD takes a momentous geological event--in this case, the great San Francisco Earthquake of 1906--and proceed to tell us as many stories leading up to and out of it as he possibly can, covering not merely accounts of the event itself (particularly the disastrous fires that came from it) but also ways of understanding the event within its multiple contexts. He tells us much about the commerical and social history of California as well as of the geology of the San Andreas Fault, Iceland, Missouri, Indonesia... s you can see, at times it _does_ get a little much. Winchester loves to amble through all these events at his own pace, but the result is a book that often reads as if it were hardly edited. His prose leaps about with weak transitions (along the lines of "As we have seen earlier," "And this brings us to Enrico Caruso," "And this is not the first time he shall appear in these pages, as we shall see," etc.) and seems as irruptive and eruptive as the events he chronicles; his intriguing and edifying narrative would have surely benefited from more studied editing and more careful organization. There's a wonderful book buried in here, but as with some of Winchester's earlier books this seems rushed and undigested.