ETA: I found my original review! YAY! So skip ahead to the more in-depth one
I wrote a semi-long review as to why Cracks was just so utterly underwhelming...However, I can't for the life of me find that damn review. I have no idea what file in my many computer files, I stashed it in. So, here's the gist:
The book: meh. The author inserts a character with her name in it, which I found self-indulgent. Characters: double meh because they're pretty much all depth-less souls doing crazy, shitty things. Plot: Okay.
Movie: Amazing. The acting was spot-on. The script took the interesting plot, fixed it up, and added things that just made the characters shine. You have the meh villain in the book, and you're given a reason as to why she is how she is in the movie. In the book, you see a villain, in the movie you see a complicated, troubled woman (who's played by the lovely Eva Green) who you are both repulsed and enchanted by (before you find out how disturbing and pretty much bat shit crazy she is. The filmmakers take a mediocre book and turn it into a wonderful movie.
So, in conclusion: skip the mediocre book, watch the amazeballs movie.
Getting right into it, I picked up the novel Cracks after I found out that the film, which I had not yet seen but wanted to, was based on it. Read the book in a couple of hours, then watched the film the next day. I have to say that Cracks is one of those rare exceptions where the movie surpasses the book in every way.
Usually the way things work when a movie is based on the book is that the movie a lot of the time winds up falling flat when compared to its original source. It makes sense when you consider that (unless it's a mini series), the filmmakers are trying to condense a book into a 2 hour movie. However, seeing as how Cracks was a pretty short book, I found that the opposite happened. I found the characters much more intriguing in the movie than in the book.
Take for example the character of Fiamma. She comes off very aloof and somewhat superior in the book. It makes sense when you consider that Cracks is narrated in the first person by one of the girls on the swimming team, while in a flashback. Clearly, the narrator would view Fiamma as superior to rationalize her (as well as the group's) actions towards the end of the book. However, as a reader, you don't get the sense that you know anything about Fiamma. While it's impossible not to sympathize with her considering what happens, you get to see more of Fiamma's essence in the movie. So, when the end came, I was left feeling equally heartbroken in both the movie and the book, but whereas I felt heartbroken as to what happened to a child in the book, in the movie I was heartbroken as to what happened to Fiamma.
Miss G. is another character that was particularly one-note in Cracks. While reading, I was kind of baffled as to why all of these girls seemed so infatuated with her. We don't know much about her in the book, only that she's really manipulative. However, in the film version you get a way more complex character. You get to see how these girls fall in love with her (hell, at the beginning I think even I was in love with her), you get to see the depth of her villianness, but you also get a multi-faceted character who while equally mysterious in both the film and the book, is also someone who is endlessly fascinating to analyze (now a disclaimer in which I say that her infatuation and subsequent behavior in regards to Fiamma was disgusting and I don't condone anything she did in either the book or the movie. But she was a damn intriguing character).
Also one random thing that bugged me in the book version of Cracks was the fact that the author infiltrated herself into the novel. I understand basing a character on yourself, but once you give that character your full name, I'm inclined to believe that it's a little more than self-indulgent.
Overall, I found Cracks to be extremely disappointing. It was a book that had enormous potential due to it's taboo plot, but it just fell short. Hell, it WAS short. 165 pages full of characters that at the end of the day, you realize you don't care much about...whereas in the movie I found that I cared about all of them even Miss G. (again, I'm well aware of how monstrous her actions were. Damn, Eva Green and her fantastic acting for making me feel slightly bad for Miss G). So, if you're given the choice as to read Cracks or watch Cracks, pick the film every single time. Powerful movie, disappointing book.