Quick Plot Summary: Released in 1943, Salainen ase is a Crime, Thriller film directed by Erkki Uotila, written by Eero Pursi. The narrative dives into the criminal underworld with a grounded sense of realism and complex morality. It provides a scannable look at the movie's central conflict involving Ensio Jouko as vakoilupäällikkö J. Rosenberg, "Pupsik".