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Having decided on murder, he should plan it all with the utmost cunning, and only slip up over some tiny unforeseeable detail. The means chosen should, of course, be poison.
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In more than half the cases [which Orwell cites], the object was to get hold of a certain known sum of money such as a legacy or an insurance policy, but the amount involved was nearly always small. In most of the cases the crime only came to light slowly, as the result of careful investigations which started off with the suspicions of neighbours or relatives ....
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But it is difficult to believe that this case [a post-war London crime involving almost random shootings] will be so long remembered as the old domestic poisoning dramas, product of a stable society where the all-prevailing hypocrisy did at least ensure that crimes as serious as murder should have strong emotions behind them.
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