I Must Be In The Minority
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I haven't actually read the book, but I know the story from the PC game. The main reason I'm not fond of it is: SPOILER..............................................I don't like how the murderer gets away with his crimes. It IS ingenious, the way he does what he does, but I just can't get past the fact that he gets away with everything. Anyone else feel the same way? P.S. Please refrain from throwing rotten vegetables at me. 
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If you want to discuss getting away with it, see The Murder On The Orient Express!