Kártyavár

Barta has been investigating for a year in the murder case of a professor of medicine. Keller, the victim, has been shot dead in his own villa. Barta joins the closest relatives and they all travel to Dunaszentmárton by ship for the inaugural ceremony of his tomb. In the Keller-villa he catches the victim's closest colleague, professor Pukner in his search for the corpus delicti among the documents. In the flash of a lightning they can catch the glimpse of a fleeing person. On the way home, the detective is helped by the captain of the boat narrow down the group of suspects. Suddenly, Aunt Olga, Keller's house-keeper lady falls dead into the waters of the Danube. It turns out soon, that she had to die because she had tried to blackmail Éva, the only heiress. (oficjalny tekst dystrybutora)