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，两名卧底侦探争相揭开谜底揭开凶手的面纱。他们唯一的线索：每个受害者都是一个前警察，每个人的身体上都有一个血红色的字母。在杀戮者在血中拼出他们的信息之前，有多少人会死？