At the climax of the story, Christopher finds letters that his mother has been mailing him. It turns out his father has lied to him about his mother's death. This is a vital point in the development of Christopher’s character. His disability plays a major role in how he copes with this discovery. Since he thinks so logically, he assumes that since his father has admitted to killing the dog, he could very well do the same to him. We then are able to see Christopher’s journey to find his mother, to find safety and comfort. Despite seeming to lack most human emotion, Christopher still exhibits basic human instinct. He thinks he’ll be safe with his mother, and so he does whatever it takes to get to her. He uses all his skills and intellect and actually makes it to his mother’s flat in London.