...though The Shutter Island is a very good novel, I can't shake the feeling that there is some level of dishonesty in the narrative. Both real and imagined events are presented from the point of view of a neutral observer. One thus tends to think that he is being presented the facts as they are.
Reminds me of a short story by Isaac Asimov I read long ago, in which Asimov (deliberately) spelt a word the way it was pronounced and used this as a cheap trick to set up and resolve the tension in the story. I don't remember what this story was about, except that the word was 'Bailley' or something similar sounding. I vividly remember feeling very cheated, though.