Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Unexpectedly Wonderful

Yep you are going to know all about Krakatoa, but Mr. Winchester gives you so much more. You'll know why you now know all this stuff about Krakatoa and this is where Mr. Winchester shines - you will end up with a different world view just because you wanted to know about Krakatoa. I only recommend a couple of non-fiction works to my friends and this is one of them.