Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A promising start but a disappointing ending

I was hooked at the start with the mysterious story of a man trying to figure out what really happened to his wife and daughters in a bizarre plane crash. But half-way through the novel Koontz ran out of gas and settled for a very contrived and boring ending. It reminds me of the action movies which rely on chase scenes and special effects instead of plot and character development to finish a good story. I'd like to see him go back and re-write the whole second half of the book but until then, I'm sorry I read it.