The main character is Jan Edigey-Korycki (Paweł Małaszyński), who returns to his hometown - Krakow to unravel the shocking murder of his beloved mother. In this helps him his friend, Henry Skarżyński (Eryk Lubos), and his sister, Veronica (Anna Próchnika), who lead the first forensic laboratory in Galicia. John meets there also his unhappy love - Constance (Magdalena Cielecka).