Instruct: Classify a given review as either positive or negative.
Query: A nostalgic look back at the olden days of serial murder

Dapper ladies man HH Holmes was undoubtedly the most cunning and ruthless criminal of America's Gilded Age. Dozens of people met their death in his infamous "Murder Castle", a nightmarish structure outfitted with secret passageways and an underground dungeon complete with vats of acid and operating tables. His exploits made him the most famous villian of his time. Yet he is largely forgotten today, an injustice that Schechter's riveting book will hopefully correct. Not simply a fascinating piece of historical reportage, "Depraved" is also a real life suspense thriller that will have you reading well into the night. An instant true crime classic