Two friends think that they've discovered a dangerous spy hiding in a mine shaft.
Karlik Rudniok
Franek Miksa
Stefan Gola
Kryza
Miksa (Franek's father)
Miksina (Franek's mother)
Sądej
Rudniok (Karlik's father)
Bolesławiec
Headmaster Zajączkowski
Kropa
Sztelmach
Kupść
Stachurka
Miner (uncredited)
Man with a Flag (uncredited)
School Inspector (uncredited)
Woman in an Office (uncredited)
