A biographical film about a Czech doctor, Dr. Jánský. The athletically inclined medic Jánský successfully completes his studies. He wants to become a surgeon, but finds himself in Professor Kuffner's psychiatric clinic, where, together with his colleague Kozdera, he tries to uncover the connection between blood clotting and mental illness. They make the surprising discovery that human blood can be divided into four groups and thus prevent it from clotting during transfusions. However, Jánský's discovery is met with misunderstanding by the Czech medical community...
Vladimír Ráž
as Dr. Jan Janský
Zdeněk Štěpánek
as Prof. Kuffner
Jiřina Petrovická
as Hedva
Vlastimil Brodský
as Dr. Kozdera
Svatopluk Beneš
as Dr. Regent
Rudolf Hrušínský
as Kurzweil
Rudolf Deyl
as Papik
Radovan Lukavský
as Kolcava
Vlasta Chramostová
as Kolcavova
Gustav Hilmar
as Prof. Kyselka
Světla Svozilová
as Kyselkova
Bohuš Hradil
as Dr. Pluhar
