Interesting. Probably not the book I'd choose to first get into FLW but it's the one I had on hand so. 
A very fair assessment of the architect himself, though at times I would've appreciated a show-not-tell approach with the building descriptions and interpretations. Misogynistic prejudices are prevalent especially on the first chapters that deal with Frank's childhood where the author tries to diminish his mother's influence in favor of the father even though he has little to zero evidence of this.