I have to agree with ceres r that this book is hardly worth the money. The writing, like in many strategy guides, is very poor, but it does get the job done. However, I find it hard to believe that anyone would need help with the single-player in the first place. The best part about wold is the multi-play, and this is where hte book really comes up short.
I would reccomend searching the net for walkthroughs and tips. Save your money for something more useful, like the upcoming expansion for wolfenstein: Enemy Territory!