I haven't read this book for years - not since my A-levels, in fact (so at least oooh three years ago ) But I remember really enjoying the way he writes and it being a good story to boot. If you haven't seen it, there is a very famous film which I would recommend.
BTW, I had to buy a copy which includes the sequel, as that was all that was available in translation - don't feel you have to read both, although obviously if you like it and have the time, go for it!