Rudi Kranzow has made a name for himself in the red-light district of St. Pauli, and his "Blaue Banane" is one of the most exciting strip clubs in this hot spot. Here, Lajana, temptation incarnate, dances while ex-boxer Sugar, Kranzow's loyal bodyguard, kicks out uninvited guests. Mizzi, an aging prostitute who is an excellent cook, and Karin, alias Karl-Heinz, a transsexual with a big mouth, are part of the furniture. When Kranzow, nicknamed Würfel-Rudi (Dice Rudi) because of his passion for gambling, is unable to pay his gambling debts, fish wholesaler Graf, who controls the scene from behind the scenes, reaches out for the "Blue Banana."