Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Hercule Poirot & Ariadne Oliver team up again in this satisfying mystery set in 1960s London

I've been a Christie fan since 8th grade and have read them all so many times that I always remember whodunit. Nevertheless, I find them a relaxing and enjoyable read when I'm taking a break from more weighty fiction.This book features two of my favorites- Hercules Poirot and Ariadne Oliver. When a young girl comes to see Poirot and confesses she might have committed a murder before running out claiming he was too old to help her, Poirot is on the case. As he tracks down the identity of the girl and searches for a death that might fit the bill, Mrs. Oliver add bits and pieces of important information that help him solve the case. The final solution is one I never saw coming (the first time I read the book at least)- a very satisfying mystery indeed!