Speculative Fiction Book Club: Guards! Guards! by Terry Pratchett

Next meeting we delve into Terry Pratchett's Discworld universe with 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...

Summary by Goodreads