Hauptkommissar/Chief Inspector Friedrich Naumann - played by old pro Paul Bildt, veteran actor of over 180 movies - operating in a Berlin still reeling from the immediate devastation WWII caused on all levels, attempts to break the most ruthless gang's grip upon the black market which is a necessary evil in this zero hour and brings the worst and the innocent into the same cauldron. Naumann targets the Club "Ali Baba" to strike a blow at its owner Goll (Harry Frank), the black market's kingpin, but one of Naumann's own men, Becker, is an informer blackmailed by Goll to keep him one step ahead of the law's movements. After the unsuccessful raid and the "official" closing of the file Naumann continues his investigations by himself, but as he gets too close to busting all up by finding evidences of irrefutable nature he is murdered. Not long and another Naumann enters the scene: Friedrich's PoW returned son Paul begins working as Goll's driver in the drug pusher gang. The different connections between gang leader/club owner Goll, sidekick and employee Yvonne (Nina Kosta), informant Heinz Becker (the blackmailed workmate of murdered Chief Inspector Naumann) and son Paul Naumann (approaching the moment he understands Goll brought about his father's death) provide tense levels of interaction. The police won't let it rest after Friedrich Naumann's murder and make a second attempt to raid the Ali Baba Club without Goll being tipped off this time and the police take him down with the gang.