A police detective finds herself at the centre of the most dangerous case of her life when she is seconded on to the investigation into the murder of a drugs trafficker. What nobody around her knows is that she is the missing witness that the police and the killer are searching for. 一名警探在调查一宗毒贩谋杀案时，发现自己身处在这一生最为危险的一个案件中心。她身边的人都没有发现，她就是警方以及杀手都在追查的那名关键证人。
