It's a bit hard to put my finger on it, but something about this book is extremely fascinating and interesting. It is incredibly well written and very efficiently drops you into the story and lets you experience the vivid sights, sounds and smells. The main character can seem somewhat inhuman and unrealistic, but at the same time, there is something very normal about him. Moreover, his relative lack of emotions creates a void that provokes many of your own emotions to fill it. The book has an interesting way of dealing with the themes of absurdity, responsibility and morality. It's all tied together with the ideas of existentialism - that life has no higher meaning beyond what we give it - and it's definitely a story you'll have to mull over for a while once you're done with it.