Originally, Tolkien wanted Lord of the Rings to be one book. However, his publisher advised him to split the book into a series so that more people would be inclined to read it. The magnificent story begins with a young hobbit named Frodo and the journey that would lead him across Middle-Earth on a trip to destroy an ancient dark ring. The ring he inherited from his uncle Bilbo Baggins and now, Frodo must travel to Mt. Doom to cast the ring in the only place it could be destroyed. Three fellow hobbits, two men, a wizard, an elf, and a dwarf accompany him. Frodo must face Black Riders who serve Sauron and Orcs. At the end of the book, Frodo decides to split away from the fellowship because it is becoming too dangerous and it is Frodo’s burden alone. Sam, his hobbit friend, goes with him.
The book is different from the movie just like any movie adapted book. It has more details and you learn and connect more with the characters. In parts of the book, you could actually find that some of the dialogue is the same as in the movie!