As a string of brutal murders plague the city, two undercover detectives race to solve the mystery and unmask the killer. Their only clues: each victim is a former cop and each has a blood-red letter painted on their body. How many will have to die before the killer spells out their message in blood?由于一系列残忍的谋杀案困扰着这座城市,两名卧底侦探竞相解开谜团,揭开凶手的面纱。他们唯一的线索是:每个受害者都是前警察,每个人身上都有一个血红色的字母。在凶手用鲜血表达他们的信息之前,有多少人会死去?