Instruct: Classify a given review into positive or negative sentiment.
Query: Perfect

M. Hercule Poirot, the armchair detective, helps our hero Colin Lamb & Detective Inspector Hardcastle make sense of 'The Clocks' murder. The story is intricate and impossible to figure out. In customary Christie style, you are kept going till literally the last pages of the book where it is all explained to you and you realize how far off you were - I LOVE IT. If you want the best detective/murder mystery or are simply looking for a challange, you cannot do better than this book (except for one Christie's other works, of course).Pssst.. Here's a hint: the book could've well been called 'The Stiletto Heel.'