'Beating people up in little rooms . . . he knew where that led. And if you did it for a good reason, you'd do it for a bad one. You couldn't say 'we;re the good guys' and do bad-guy things.' 

 

Koom Valley, the ancient battle where the trolls ambushed the dwarfs, or the dwarfs ambushed the trolls, was a long time ago.

 

But if he doesn't solve the murder of just one dwarf, Commander Sam Vimes of Ankh-Morpork City Watch is going to see it fought again, right outside his office.

 

With his beloved Watch crumbling around him and war-drums sounding, he must unravel every