Instruct: Classify a given review into positive or negative sentiment.
Query: Hard to put down

Maria Eftimiades has given us a well-written, well-researched book on a murder that took 20 years to solve.I don't know who I was more disgusted by: the sociopathic, cruel murderer Stephen Scher (who drove his first wife, Anne, to the brink of suicide); Pat Dillon Scher, who remains a spoiled brat to this day; Martin Dillon's two children who "disowned" their own grandparents for wanting the murder of their own father to pay for his heinous deed (Suzanne I would especially love to slap) or Pat's parents, who raised her to think she was better than everyone else in the world and "deserved the best", no matter who she hurt to get it.All in all, great book. Difficult to put down!