Exactly says on the title, it covers notable literary works that have been adapted into major motion pictures from the early days of filmmaking to the late 1990s. Regardless of whether or not these novels-to-films were successful, John Tibbetts & James Welsh looks into notable adaptations. In which, they go into analyzing the novels and compare them to how they are presented visually to the public. While some literary enthusiasts would say the novels are better, the authors show that's not always the case, with some films are better at presenting the story than the source material whether through cutting around the fluff or re-tweaking the book's message to a more cohesive structure. As the authors imply in their writing, the best movies based on books are ones that managed to capture the essence of the story while successfully translating words into a way that can work onscreen, even if it means adding something original to the film.
While I found this encyclopedia interesting, mainly looking at familiar works and seeing what they consider the better film version out of the bunch. However, because it covers a vast amount of books, it can be very tedious in details. Moreover, some adaptations are overlooked or rarely given a mention in the authors' opinion on where they stand in the pack. And at times, it can be a little dry in analysis, but still worth a read for filmgoers and bookworms who are interested in learning the versions through the years.