3 Days Earlier...

A young boy has been found dead, murdered by a person with a knife. The detective, Detective White, has been hired to discover the "secret identity" of this masked murderer. Little do the suspects know, he himself is, in fact, the killer. As he "evaluates the clues", many of the witnesses start to go missing, then turn up dead the next day. Can Detective White discover this second killer while keeping his identity a secret?