Instruct: Classify an Amazon review into positive or negative sentiment.
Query: A bit disappointing for Crichton fans

I have read three Crichton novels: Jurassic Park, Timeline, and Disclosure, and have generally enjoyed them as compelling, fast moving, and thought provoking. They invariably involve a scientific (or legal, in the case of Disclosure) concept that is extrapolated to create a gripping story, despite somewhat flat characters. Congo, however, was a disappointment. While he builds on two scientific concepts--animal communiciations and evolution--the story fails to grip as it should, pushing him to add some additional conflicts just to maintain some suspense. And while they seemed forced, they might have provided for a satisfying story if only all of the loose ends were resolved at the end. But they weren't, leaving me with a hollow feeling. My recommendation for a reader who has never read Crichton to try Jurassic Park or Disclosure. For those who have, avoid this one.