Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Comedy Sci-Fi?

No spoilers! Our protagonist happens to be a writer. And he expounds on what ít's like to be a writer. In 2 of these passages, Heinlein is quite funny about the craft of writing. However, the rest of the book is pretty dreadful. Instead, read The Puppet Masters or Starship Troopers - both are quite good.