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Christopher has Asperger's syndrome and is the narrator of this novel. He has the difficult relationship with other people common to those with severe Asperger's, and he doesn't like to be touched. He is incapable of telling lies.I think his condition certainly isolates him. He feels alone for much of the novel. Chris's condition seems to also give him a keen attention for detail. He also observes the world in different ways than "normal" people.