Action flick about penniless cab driver Harry – played by Harry Piel – who, one day, comes into possession of a suitcase left behind by a passenger who is on the run. The suitcase contains a magic hood that renders its bearer invisible. By means of the magic hood Harry and his room-mate Fritz make an enormous fortune. But their antics with the hood have severe consequences: Harry loses the love of honest flower seller Anni, and Fritz even becomes a ruthless criminal. When the two former friends end up in a mortal fight, Harry finally wakes up drenched in sweat. He has only had a bad nightmare: The suitcase contains an innovative aviator helmet that is worth a generous reward permitting Harry to save Anni′s flower shop from financial ruin.