* The general message of the book is that werewolves and humans cannot have stable romantic relationships because humans cannot love all of a who/what a werewolf is. In the book Vivian chooses her kind over human kind. The movie states the exact opposite, as Vivian and Aiden are still together at the end.
* In the book, all characters are American and the story takes place in Maryland. In the film it takes place in Romania and some characters have English, French or Romanian accents. Vivian and Aiden are the only characters with American accents.
* In the novel, none of the wolves' eyes change to gold when they smell the scent of blood.
* Vivian's mother Esme is alive and her father dies in the novel; in the film both her parents are dead. In the book Vivian is an only child, but in the film it is shown that she had siblings, who were killed along with her parents.
* In the film Vivian blames herself for her family's death; she explains to Aiden that her paw prints were found by the enemy, leading them to her family. In the book, only her father dies and it was caused, albeit indirectly, by the Five.
* Aiden, Vivian, and the Five are high school students in the book. Vivian is in her teens and Aiden is a junior in High School. The Five are presumably in their late teens as well. In the film, Aiden appears to be older than Vivian, who is nineteen (as revealed by Astrid in the film's beginning). Beyond Vivian's, no specific references are made to any characters' ages or to school.
* In the book, Astrid and Gabriel were never mates. Rafe is neither their son, but the son of Lucien Dafoe, nor is he Vivian's cousin. Also, Astrid is not Vivian's aunt and is actually the main antagonist in the book. However, Astrid in the film takes on the role of Esme in the book, and envies Gabriel's mate in the film like Esme does Astrid in the book. Gabriel's mate also fits Astrid's physical description in the book.
* Rafe – and the rest of the Five – are attracted to Vivian in the novel; She and Rafe had dated at some point before the story takes place. This is not mentioned in the film.
* Rafe and Astrid are lovers in the novel; in the film they are mother and son. In the book, her son is Ulf of The Five.
* In the film there is no Ordeal between the male loup-garoux, and no Ordeal between the female loup-garoux. Gabriel is the leader from the start, instead of participating in the Ordeal as he did in the book. The rule is based on bloodline rather than triumph.
* Aiden is alone in Romania in the film; in the book he has friends and family around him other than Vivian.
* In the beginning of the novel, a character named Axel - a friend of the Five and Vivian's former primary romantic interest – was mentioned several times. Axel does not appear in the film.
* In the novel, it was Axel, and not Rafe, who murdered a girl because she rejected him.
* Vivian has an Uncle Rudy, Esme's brother, in the novel. In the film, she has no uncle.
* Vivian works at a chocolate and sweets shop in the film; she has no such job in the book.
* In the novel, when the pack leader takes a mate, she is his mate for life unless another female loup-garoux challenges and defeats her, or the pack leader approves of her new mate. In the film, the leader takes a mate every seven years.
* Gabriel is generally a protagonist and does not permit the pack to kill humans for pleasure; in the film he is the antagonist and encourages the killing of humans.
* Vivian is presumably a gray and brown loup-garoux in the book. However, in the film a white wolf was chosen to depict Vivian in her wolf-form.
* In the book, there is no prophecy.
* The book mentions an elderly female loup-garoux, Aunt Persia, who cures every ailment the loup-garoux may have including Vivian's silver poisoning, however in the book Aunt Persia does not cure Vivian's silver poisoning. In the film, she is not mentioned and an old pharmacist gives Vivian an antidote.
* In the book, Aiden gives Vivian a silver pentagram, which he later melts down into the bullets he shot Vivian and Rafe with. In the film, Aiden owns a pentagram necklace but does not give it to Vivian. He uses it to kill Rafe.
* In the book, silver can only kill if it enters the blood stream. In the film, it only needs to touch a loup-garoux
* In the book, Vivian's parents had been the leaders of the pack before Gabriel, but the film never mentions this.
* When Vivian reveals her secret to Aiden in the book, he is terrified and wants nothing to do with her. In the film, Aiden is initially terrified and runs away from Vivian, but falls back in love with her after she saves him from the other loup-garoux.
* In the novel, the pack members shape-shift into their alternative forms. In the film, the transformation is much more spiritual, depicting Vivian and the others as humans who almost seem to ascend into a higher
Answered By: katiepie :) - 1/12/2009