Guards! Guards!

This is where the dragons went. They lie ... not dead, not asleep, but ... dormant. And although the space they occupy isn't like normal space, nevertheless they are packed in tightly. They could put you in mind of a can of sardines, if you thought sardines were huge and scaly. And presumably, somewhere, there's a key ... A night-time prowler is turning the inhabitants of Ankh-Morpork, the greatest city in Discworld, into something resembling charcoal biscuits. Captain Vimes of the City Watch is given the task of tracking down the culprit, a seventy-foot dragon.