I read the book. Here are some observations:
1) The mainstream coverage of this story has been awful. Mainstream journalists are quick to deride 9/11 truthers but have never accounted for their own conduct. By that I mean the al-Hazmi/al-Mihdhar story is an open conspiracy with no credible government explanation and some of the most respected journalists in the country have simply not covered it. Duffy and Nowosielski deserve credit for their effort.