In the Post-World War II, in Los Angeles, a criminal shots and kills a police officer in the middle of the night       Without any leads, the chief of the LAPD assigns Sgt       Chuck Jones and Sgt       Marty Brennan to investigate the murder and apprehend the culprits       When the dealer of electronics devices, Paul Reeves, is caught selling a stolen projector, the police identifies the criminal, and connects him to other unsolved robberies       Using the witnesses of his heists, they draw their face, but the true identity of the smart and intelligent criminal is not disclosed       The perseverance of Sgt       Marty Brennan in his investigation gives a clue where he might live