Instruct: Classify the given review into positive or negative sentiment.
Query: Not worth the money.

Not working very well is a "new" book by Agatha Christie, who died in 1976. Christie actually left two unpublished novels which were published after her death, but this is not one of them. "Black Coffee" is a play written by Agatha Christie which has been adapted as a novel by Charles Osborne, whomever he may be. Whomever he may be, he should have done something else.While "Black Coffee" might be a good play, it is much too thin to be a novel. I knew the murderer before the murder took place, and there was not enough development of character to make the book real. Agatha Christie has sold more books than anyone except for the Bible and Shakespeare. She had only one daughter, and the number of her descendents is small. They've all got to be either incredibly wealthy or incredibly stupid. I don't think there is much excuse for them to allow this travesty to be published.