Berlin in the 1920s is a vibrant metropolis. After the horrors of the First World War, people seek their fortune at parties, in glittering variety theaters and dance halls. So-called "ring clubs" dominate the world of crime. When Inspector Paul Lang finds his friend, public prosecutor Barnekow, dead in the crocodile pool of the Tiergarten, the mastermind seems clear, at least to him: the murder clearly bears the signature of Immanuel Tauss, the former head of the gangster ring "The Crocodiles". ...