I knew very little about 'lighter-than-air' history or technology before reading _Pumpkin Seed_, but McPhee assumes no prior knowledge. Indeed, one of the things I like best about McPhee is his ability to explain topics of a complex nature to a lay audience.
The story's 'characters' are exquisitely developed, and their interactions with each other are sometimes tragic, often hillarious. A number of them would make fascinating subjects for biographies in their own right.
If you have any interest in avaiation history, or just enjoy reading a well-crafted non-fiction work, I highly recommend this book.