In the late 1990s Kathyrn Bolkovac -- a Nebraska police officer and divorced mother of three -- answered a job ad to work in Bosnia for a U.S. defense contractor. She looked forward to a good salary, travel and the chance to help rebuild a war-torn country as a human rights investigator. She expected hard work and real challenges. But she never expected her investigations into sex trafficking and prostitution rings would implicate some of her U.N. colleagues and put her life in danger. Whistleblower Kathryn Bolkovac on fighting the sex trade -- and why she was fired from her job.