Rent Elephant White (2011)

When the daughter of a powerful businessman is kidnapped and murdered by a notorious gang of Thai sex-traffickers, skilled mercenary Curtie Church along with ruthless weapons dealer Jimmy The Brit are hired to hunt the gang down and take them out. However what starts out as a paying job soon turns into an outright war between two rival gangs, and Church finds himself caught between the corrupt world that surrounds him and the truth behind the man who hired him...