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InthePost-WorldWarII,inLosAngeles,acriminalshotsandkillsapoliceofficerinthemiddleofthenight.Withoutanyleads,thechiefoftheLAPDassignsSgt.ChuckJonesandSgt.MartyBrennantoinvestigatethemurderandapprehendtheculprits.Whenthedealerofelectronicsdevices,PaulReeves,iscaughtsellingastolenprojector,thepoliceidentifiesthecriminal,andconnectshimtootherunsolvedrobberies.Usingthewitnessesofhisheists,theydrawtheirface,butthetrueidentityofthesmartandintelligentcriminalisnotdisclosed.TheperseveranceofSgt.MartyBrennaninhisinvestigationgivesacluewherehemightlive.