 The action is set in and around a police station in St Pauli, the docks area of Hamburg where prostitution and crimes of violence are rife. Glantz is the head of the uniformed officers, and does his best to keep order. Bruno Kapp has just got out of jail, and it looks as if he is going to seek revenge on Glantz for sending him down in the first place. Glantz doesn t take this seriously, and then suddenly he is alone on the roof with Kapp, and Kapp has got a gun ...