A dramatic patrol car weekend on the streets of Prague's city centre. Lieutenant Josef Kabát and his colleagues drive through the centre of Prague every day in a patrol car. He loves his neighbourhood more than anything and wouldn't trade it for a more comfortable life in the office or at the control room. After a citizen calls the 158 emergency line, Kabát goes to various cases, be it accidents, thefts, disturbances or assaults. In one burglarized apartment, he finds the perpetrators' broken dioptric glasses and a torn piece of leather jacket. These are exactly the kind of things worn by his 18-year-old son Pavel, who coincidentally disappeared at the same time, allegedly with friends on a cottage holiday. However, Kabát has no time to deal with his family problems: there are too many thieves and shady characters roaming the streets of Prague. The worst of them are a couple of young men who have just raped and murdered an innocent girl...