The Bourne Identity in Roger Ebert's eyes

I've noticed that a few blogs have mentioned that the Bourne Identity was a book too. In this review by Roger Ebert there is absolutely no mention of a novel. All he seems to talk about is the screenplay. Ebert also only criticizes the film for its lack of meaning. However, he does mention how well acted the film is and how good the action sequences are. The only problem? Ebert seems to only be able to blab about what happens in the movie, but then again, that's his job.