Krakatit
Krakatit is a 1948 Czechoslovak science fiction mystery film directed by Otakar Vvra, starring Karel Hger as a chemist who suffers from delirium and regret after inventing a powerful explosive. The film is based on Karel apeks novel with the same title, written in 1922. The name is derived from the volcano Krakatoa.
A sequence begins where the man walks along a street in delirium. An old classmate, Ji Tome, greets him and we learn that the mans name is Prokop. He speaks incoherently about an explosion and something he calls krakatit. Ji brings him home and puts him in bed. In a dream, a university professor asks Prokop about krakatit. He answers that it is a powerful explosive, named after the volcano Krakatoa, and explains its formula. As the dream ends we see that Ji has written the formula down. Prokop wakes up alone in Jis apartment. He finds a note which says that Ji has gone to his father. Prokop opens the door when a veiled woman rings the bell. She begs Prokop to deliver a letter to Ji. Prokop, still not recovered, decides to visit Jis father, a countryside doctor. An old, horsepowered mail carrier gives Prokop lift. Upon arriving he learns that Ji has not visited his father in a long time. Prokop collapses.Tended by the doctor and his daughter Ani, Prokop slowly recovers, but cannot recall what has happened. One day he reads in a newspaper about krakatit, which is being promoted by someone named Carson, and Prokop suddenly remembers the explosion in his laboratory. He rushes to the laboratory where he meets Carson, a representative from Balttin Works, a foreign weapon manufacturer. Carson explains that Ji had sold them Prokops stock of krakatit and the formula, and that their experiments with krakatit have shown that it is a highly deadly explosive which can be detonated with highfrequency radio signals. However while they have the formula, they have failed to figure out the production procedure, and offer Prokop to work for them. Prokop declines but is brought to the Balttin palace by force. ........
Source: Wikipedia
