Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Superb mystery.

I loved this book. It may be that I loved it more having just returned from a vacation in Portugal, but so be it. The mystery is told in the present and past, and it is fun to watch the past and the Nazi mystery move closer in time to the present. What I really liked about the book was the author's ability to use every character and to good economical effect--there are no loose ends. This is a book to read on the weekend, because you won't want to put it down. And you won't want to lose your place in time, because the action goes back and forth so quickly. The added piece is the taste and sights of Portugal. Robert Wilson loves his Portuguesse food, wine, and bicas, and he can take you to Lisbon, Cascais, and Alcantara with his writing. This is well worth a reading.