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In page Inspector Morse:

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Morse is highly intelligent. He is a crossword addict[1] and dislikes grammatical and spelling errors; in every personal or private document that he receives, he manages to point out at least one mistake. He claims that his approach to crime-solving is deductive, and one of his key tenets is that "there is a 50 per cent chance that the person who finds the body is the murderer". Morse uses immense intuition and his fantastic memory to get to the killer.