Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Easy and enjoyable

What would you do if you found yourself stuck in 14th century France? This is exactly what happens to Prof. Johnston. So he leaves a clue in the future so his students can go back in time and rescue him. This is an old-fashioned adventure story, and I highly enjoyed it. Much easier read than most of Crichton's stuff, yet still has a lot of scientific stuff in it.