Located in Killer Clan Camp Library south of Haisk, 

You pick up and begin to read How to Mug Successfully:  A 4 Step Method.

1) Have a blunt weapon:
   A blunt weapon is necessary to jar someone's head and make 
   them pass out.  Using piercing weapons, slashing weapons, 
   or your hands will make you look foolish.

2) Be hidden:
   One must be properly hidden to even remotely have a chance 
   to knock a victim unconscious.  To do this one must find a
   shadowy place.  Once there, conceal yourself in the darkness.

3) Find a suitable target:
   The shorter and fatter they are, the easier they fall.  Also, 
   it may be a good idea to pick a target with considerable wealth.

4) Aim for the head:
   A hard blow to the head will take someone out for a great deal 
   of time.  Make sure you aim for the back of their head so they 
   won't see you coming.

5) Loot all you can carry:
   They're down, and you're greedy.  Take it all.