Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Grand Duchess and Saint ill-served by flimsy biography.

Hugo Mager's recent book speculates, second guesses, and willfully reinterprets the life of a truly noble woman. His lack of attention to detail (The Sergeievsky Palace is 19th century and was built for the Belosselsky-Belozersky family. It is not, as he claims, 18th century, and built for the Beloseilsky-Belosievsky family) is irritating, and his editor should be shot for allowing the grammatical mistakes with which the book is riddled. A big snooze. For beginners only.