This book is by historians, for historians. If you are willing to take the very dense amount of fascinating information, it has so much to offer. If you are looking for something like Guns, Germs and Steel, I question how you got here.
This is a very good book if you are interested in the political history of Seattle. It is extremely well researched and full of detailed information. It does not give much of an everyday human context, as in what it was like to live in the city during that time, but I don't think that was its goal. I found it to be a useful resource for my research for a story set in that time.