Koom Valley? That was where the trolls ambushed the dwarfs, or the dwarfs 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 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 clue, outwit every assassin and brave any darkness to find the solution. And darkness is *following* him. Oh ... and at six o'clock every day, without fail, with no excuses, he must go home to read *Where's My Cow?*, with all the right farmyard noises, to his little boy. There are some things you *have* to do.