The differences between J.R.R. Tolkien's book, The Two Towers, and the Peter Jackson movie screenplay of the same name are very difficult to document because of the substantial difference in plot sequence between them. There are two major plot threads in this story that are presented very differently between the book and the screenplay. They are: 1. * the exploits of Frodo and Sam on the road to Mordor and 2. * the adventures of the other characters in the lands of the West—Gondor, Rohan, Fangorn, etc.