In Hamburg sind die Nächte lang: Reporters Peter Drante and Conny roam Hamburg’s Reeperbahn at night, uncovering three intertwined tales: Lilli, a aging dancer, searches for her missing husband who once shot her in a jealous rage; multimillionaire Alexander Borgess faces blackmail over past indiscretions; and Karin Thorwaldt seeks Borgess’s aid to secure her fiancé’s acceptance by her conservative father.