Instruct: Classify Amazon reviews into positive or negative sentiment
Query: My favorite Christie book of all-time!

Right after I finished reading this, I set the book down and thought, "Wow." Christie's intelligence and superb writing style makes you think again. It's amazing how the people who aren't even suspected end up being the culprit. The plot was complex, spellbinding, and interesting. The whole idea of murder on a cruise was great, and Christie made it even greater. A must for anyone!