Meyssan's book is actually quite short but very well researched and documented. The people in the critics say that the investigation of Meyssan is worthless, so called after checking whether they are really read the book or the comment brainwashed sheep for which we can no longer much or people por supporters who clearly only purpose to harm. Meyssan just do not really deal with the technical aspect of the attacks (unlike the dvd "loose change", which is a truly déonstration filmed), but the political aspect of the plot and its mechanisms. Its documentation is rich and numerous references and are not drawn to dark conspiracy books, but documents are declassified, are officials of the various corridors of US power or extract of the American and international press. So a book to read and do not hesitate to buy "more" is better written and documented.