Black Coal, Thin Ice - 2014 - 7/10
AKA - Báirì Yànhuǒ // 白日焰火

Two Chinese cops investigate severed body parts found on a coal conveyer belt.
They zero in on suspects then the entire case literally explodes in front of them.
Jump ahead five years. The detectives are apart, yet the old file has revived.
Challenging procedural, definitely not for ADD viewers.
Photography is flat, there are no flashy forensic solutions.
Just cops following thin leads and aberrant behavior.
Filmmaker assumes the audience has enough intelligence to follow a story, rather then being fed one.