Originally, Munk intended Eroica to be a triptych with Con bravura being the first part, but he ultimately gave up on this film, deeming it weaker artistically than the two counterparts. Con bravura is about conspiracy conflating the paths of a rather unconventional nun and an intrigued young man – each of them bears secrets and the encounter could incite a flaming romance, though one suffocated by war.Munk set the film in the mountain capital of Zakopane and its vicinity, allowing breathtaking views from a cable car and using his experiences of the Nazi occupation in the area to add gritty reality. The director plays a cameo as a priest with several of his industry friends also making appearances.
| Actor | Role |
|---|---|
 Tadeusz JanczarAndrzej | Andrzej |
 Teresa SzmigielównaKatarzyna | Katarzyna |
 Witold PyrkoszKardas | Kardas |
 Roman PolanskiCaroler | Caroler |
 Mieczysław WaśkowskiCourier | Courier |
 Ryszard BacciarelliGestapo Officer (uncredited) | Gestapo Officer (uncredited) |
 Henryk BąkMajor (uncredited) | Major (uncredited) |
| JJoanna CiemniewskaTourist (uncredited) | Tourist (uncredited) |
 Julian DziedzinaGestapo Officer (uncredited) | Gestapo Officer (uncredited) |
| KKazimierz HanzelWaiter (uncredited) | Waiter (uncredited) |
 Paweł KomorowskiGestapo Officer (uncredited) | Gestapo Officer (uncredited) |
 Barbara PołomskaRestaurant Patron (uncredited) | Restaurant Patron (uncredited) |
| AAndrzej WojciechowskiRestaurant Musician (uncredited) | Restaurant Musician (uncredited) |