Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: If You're Really Interested...

If you are interested in novel like "The Trial," I cannot promise these are Existential - but, you can try Ayn Rand's "We The Living" and "Anthem." There is also "1984" by George Orwell, and an essay by Michel Foucalt called "Panopticism." All these deal with the interference of powerful outside forces monitoring us in a free society.