In China, meth possession is taken seriously. So seriously, in fact, that the amount you can carry on your person can earn you a death sentence. That puts high-level dealer Choi (Louis Koo) in a nasty position when he's busted after a car accident. In exchange for his life, he agrees to help aggressive detective Captain Zhang (Sun Honglai) infiltrate the meth trade as Choi turns on his former associates. They've got forty-eight hours to seal the deal, but trust proves difficult as tensions run high.