When buying a book, especially if it is related to the current Iranian affairs and you have no idea if the book you're going to buy is worthy of time and money then simply turn the cover and find out who has written the praise for it or recommended it. If the praise is written by some mullah appeasers like Zbignew Berzinski or Madeline Albright, then that book is not definitely a credible book or source of information with regards to Iran. Just don't buy it. It's waste of your precious money and time! ;-)
Be cautious when spending your money on books written by dubious people who pretend to be area experts while they're simply mullahs' friends advocating for appeasement and dialogue.