Guards! Guards!: Terry Pratchett

`Noble dragons don`t have friends. The nearest they can get to the idea is an enemy who is still alive.`

The city of Ankh-Morpork is in turmoil, its citizens revolting. Again.

A shadowy secret brotherhood has summoned a dragon to spread terror throughout the city, intent on overthrowing the Patrician and ruling in his place. Too bad the dragon has ideas of its own ...

It`s up to Captain Sam Vimes and the ramshackle Night Watch to stop it. Only problem is, the Watch are more used to dealing with mobs than dragons.

And if they can`t bring down this fire-breathing tyrant and reinstate their own, slightly less dangerous one, Ankh-Morpork might be lost. For ever...

Guards! Guards! is the first book in the City Watch series, but you can read the Discworld novels in any order.