Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pretty mediocre compared to Harry's best work

The first thing you'll think of reading this minor novel is "Prime Directive," even though it has nothing to do with Star Trek. The Survey Service keeps an eye on pre-technological civilizations, with a strict hands-off policy, but a member of one team takes pity on the personable ruler of a Sumer-like culture and gives her something to cure her cancer. Unfortunately, when the next survey team comes back 1,500 years later, they find the queen is still alive and her kingdom is far ahead of where it reasonably ought to be. The Survey Service has political enemies who would like to see it shut down, and this is all the ammo they would need. And at that point, this turns into a lightweight version of a John Grisham chase story, with a bloodyminded bureaucrat committing mass murder to protect her budget. Speaking as a professional semi-bureaucrat myself, the author is way over the top on this one. I didn't find it believable at all, not even on its own terms.