Instruct: Classify Amazon reviews into positive or negative sentiment
Query: As good as Murder on the Orient Express

This mystery is one, if not THE, best Poirot mystery I have read yet. The Murder of Roger Ackroyd is up there with Murder on the Orient Express with it's unique plot, red herrings, characters, and the amazing ending.The plot revolves around a suicide of an older woman and the murder of a man by the name of Roger Ackroyd. It is told from the perspective of Dr. Shepperd, the town doctor. The ending of The Murder of Roger Ackroyd is one-of-a-kind. The culprit was a complete surprise to me. The answer was there all along, so obvious, and yet so concealed. A great mystery overall.