Each episode of this crime series shows a different story and a different perpetrator. The main character is inspector Marek Kaszowski - a workaholic, fully dedicated to his work. He is consequent and ruthless, keeping a secret that determines his decisions and opinions... he has his own morality and standards that he sticks to. His partner is superintendent Joana. She is an intelligent and well educated lawyer who is delegated to work with Marek but also to supervise and control him. At first she seems to be principled and strict but inside she is a warm, loving and above all a smart woman whose past is also haunting her. Together they try to get to the bottom of each case using methods that sometimes may be not legal but they are always effective.