Instruct: Classify the given Amazon review as either positive or negative.
Query: 19th-Century Retromystery

The world of 18th-century London comes to life through the eyes of 13-year-old Jeremy Proctor. This light and enjoyable murder mystery introduces the compassionate, brilliant blind magistrate Sir John Fielding. The mystery itself, moderately easy to unravel before the end, is not as compelling as the fascinating cast of characters.