Nebraska cop Kathryn Bolkovac (Rachel Weisz) is a divorced mother who accepts a job with Democra to be a U.N. Peacekeeper in Bosina for six months.  She thinks it will be an easy six month tour with a payday of $100,000.  She wants to be closer to her daughter that her ex-husband got custody of.   She does her job quite well and ends up being promoted to the head of Gender Affairs at the UN mission in Bosnia.   It all starts to get complicated when she tries to help two teenage girls who have been brought in as part of a sex trafficking ring.  She discovers that other peacekeepers, local cops, and other people in international positions are involved in the ring.   They don't want their part in the criminal activities revealed.   They push back and even try to bury the investigation.