Koom Valley? That was where the trolls ambushed the dwarves,or the dwarves ambushed the trolls. It was far away. It was a long time ago.But if he doesn't solve the murder of just one dwarf, Commander Sam Vimesof Ankh-Morpork City Watch is going to see the battlefought again, right outside his office.

With his beloved Watch crumbling around him and war-drums sounding,he must unravel every clue, outwit every assassin and brave any darknessto find the solution. And darkness is following him.