I bought the game on a whim during a sale because I had never read the books on which the game was based, and I really enjoyed the storyline, the gameplay was not perfect but I think this is what made its charm, and the choices you could make throughout the game to alternate the ending, as well as the option to creep or shoot your way through the levels, were a nice touch. The game will require at least two runs to complete all achievements, but with the game and plot being so outstanding, this is a positive thing, as it gives you more gaming for your money. It's was totally worth it and I am plan on playing the sequels and when I have time I will take a look at the book.