The book is not an easy read and if you are of the belief system that the Bible has "no errors" you will be unlikely to struggle through the data that the author includes showing that there have been many errors and changes made to the New Testament over the years.
The author discusses the conflicting reports in Matthew, Mark, Luke and John. He discusses how and why these differences could have occurred.
If you stick with it, it is well worth reading. I found the last few chapters to be of particular interest as they address changes made to devalue women and to fan the flames of hatred of the Jews.