Before going on a UN peacekeeping mission to Bosnia 13 years ago , Bolkovac, 51, was a police officer in Nebraska. She specialised in sex crimes, was nicknamed Xena: Warrior Princess, and had a 95 % conviction rate. She eventually signed up with DynCorp, the private contractor providing American personnel for the UN mission in Bosnia. The war was only recently ended and the country's legal infrastructure was in disarray. Then one day the body of a skimpily dressed Ukrainian girl came floating down the River Bosna. Soon after, a Moldovan girl was found wandering the river banks.