Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent WWII mystery thriller

This is an excellent WWII mystery thriller from John Lawton (read his other works). A young police officer named gets assigned to an investigation of various deaths having to do with scientists working on a secret project. The mystery gets deaper once the detective realizes that the American OSS is involved. He follows the villain throughout WWII and finallys gets to the bottom of it after the war ends in the post-war Berlin. fascinating, thrilling, dark in nature...and excellent novel from Lawton.