One of the best guides around. But before you buy it be sure that you've chosen the right system. The book walks you through the entire game. You don't have to wander in the fog and darkness without a clue where to go or what to do. It really gave me all I needed. Full items list is awesome as well ...
I've actually read this cover to cover so mine is threatening to fall a part. I love the game and this was actually pretty helpful and came with a dalmatian poster to help you keep track of where you find them at.