Those who have both seen the movie and read the book say that the movie is nearly identical to the book. There are some minor changes to details that don't affect the story, e.g., the professor and his wife are older in the book than in the movie. The movie also changes the character of the Professor's wife. In the book, she is a bossy, wide-eyed believer and uses a planchette to contact the 'spirits', getting information that is completely wrong. She believes she knows way more about the supernatural than the Professor and chastises him for his slow deliberate 'scientific' method. Professor Montague of the novel becomes Markway in the film, Eleanor Vance's last name becomes Lance in the film. The movie leaves out a few scenes, such as a small occurrence involving a ghoulish nursery rhyme. Again, this doesn't affect the story. One mentionable deviation is that Nell's infatuation with the professor is not in the book, and Nell actually comes on to Luke at one point in the book. Another memorable deviation is one aspect of the haunting: Theo returns to her room to find her clothes on the floor, trampled and smeared with what seems to be blood, and the words "Eleanor come home Eleanor" written on the walls and ceiling in the same substance. In another scene, Eleanor and Theo are outside when Theo sees something and screams for Eleanor to run; what she saw is never described or explained. One interesting difference is the focus; the book is about the haunting of the house, while the movie focuses more on Nell's nervous breakdown, and raising the question of whether it's really happening, is all in her imagination, or the result of latent psychic powers running wild. Overall, however, the consensus is that the book contains a fraction more 'story' but, in general, the movie hits the nail on the head.