Syntax?

http://www.myfonts.com/fonts/urw/syntax-ser/

I kind of don't think so, as Syntax appears to have an upper case "W" that has angled edges at the top. Also, the upper case "S" in the picture I uploaded appears to be more squashy and horizontal?

Foundry Sans comes closer:

http://www.fonts.com/font/the-foundry/foundry-sans/demi

Foundry Sans?
http://www.fonts.com/font/the-foundry/foundry-sans

Oh, that's it! It has a quirky upper case "Q" that's pretty eye-catching, which appears all through the book as body copy. Thank you, both! Very cool font!

Wish I could post both your names in the "Solved By" field, but Typophile won't let me. Will have to chose one of you, so I guess it'll have to be kthomps5 as he/she appears first in the postings, but really it's a tie!