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When the machinery of the city has come to rest and the streets are almost empty, when the windows have gone dark and most souls are asleep, you can sometimes hear it. Something clinking and clanking in a dark alleyway. A giggle. Then silence. At the end of the narrow passage a light shines through the crack of a door that has been left ajar. The hinges creak. A figure enters. Bam! The door slams shut. What's going on?