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Nothing can be more slightly defined than the line of demarcation between sanity and insanity .. Make the definition too narrow, it becomes meaningless; make it too wide, and the whole human race becomes involved in the dragnet. In strictness we are all mad when we give way to passion, to prejudice, to vice, to vanity; but if all the passionate, prejudiced and vain people were to be locked up as lunatics, who is to keep the key to the as .Kate Summerscale
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Perhaps this is the purpose of detective investigations, real and fictional -- to transform sensation, horror and grief into a puzzle, and then to solve the puzzle, to make it go away. 'The detective story, ' observed Raymond Chandler in 1949, 'is a tragedy with a happy ending.' A storybook detective starts by confronting us with a murder and ends by absolving us of it. He clears us of guilt. He relieves us of uncertainty. He removes us from the presence of death.Kate Summerscale