The movie came after the book, not the other way around. There are some major differences between the book & the movie. A key one is that at the end of the movie the law firm ends up indicted on mail fraud charges. In the book the firm, the mafia, etc. gets busted on racketeering, & God knows what else. Minor things, but still deviations, include the type of car they drive (BMW in the book, & a Mercedes in the movie), how various characters meet their deaths, & what happens on the beach.
The book is MUCH better than the movie. By comparison, the movie sucks.
Viper GTS