Safe (2012)

Luke Wright is a two-bit cage fighter, until the day he throws a fixed match. In retaliation, the Russian mob murders his family and destroys his life. Though alone and haunted by grief, Luke springs into action to save a Chinese girl (Catherine Chan) from the same gangsters who killed his family -- and lands in the middle of a high-stakes war. The girl is no ordinary child; she's a math prodigy who holds in her head a numerical code for which various factions are ready to kill.