The series is full of extraordinary cases, original characters and has a gripping plot. Each of the ten episodes of the series tells the story of a different crime. The main characters are Kazimierz Proch, his partner Witold Kielak, and pathologist Ewa Siedlecka. The prosecutor is a bit old-fashioned man who tries to solve the mystery of his family from the past before he retires. Witold, on the other hand, is his complete opposite. He is a dynamic extrovert and a father of two children. Every episode focuses on a new criminal puzzle and is also a continuation of the prosecutor's mysterious story from his past. The author of the screenplay is a world-famous journalist, columnist, and crime stories writer called Zygmunt Miłoszewski.