It is 5 May 1945 and the uprising against the hated German occupiers has broken out in Prague. The Czech guards open the gate of the Pankrác prison to allow the prisoners to escape en masse. Many of them are shot dead by the German guards but young Ruda (Jaromír Hanzlík) manages to run away. He is taken care of by one of the Prague fighters, concierge Kytka. Kytka hides him in the flat of the house's owner where only the young maid Karla (Jana Brejchová) is left, ordering her to take care of Ruda.

Three short story omnibus. The main hero and connecting link is Lieutenant Boruvka, created by Lubomír Lipsky. He deals with the murder case between climbers, the death of the dancer in the music theater and the strange disappearance of the mathematics professor.