Professor Roch, the inventor of an exceptionally strong and effective explosive substance, is kidnapped by Count Artigas, a criminal, and taken to an apparently abandoned island. Here, in the underground laboratories and factories, Roch finishes his invention. He doesn't suspect that his discovery is to be used by a gang of criminals who are planning to gain control over all of humanity. The professor's assistant, engineer Hart, who was kidnapped with his teacher, sees through the dangerous Artigas's plans and decides to prevent him from succeeding. Using a small balloon, he sends a message to the people about the danger that threatens the humanity and the people unite in the fight against an unscrupulous enemy. Hart manages to escape in an observation balloon, together with the girl Jana, who also was Artigas's prisoner. Artigas's people are finishing the construction of the giant cannon at the island's coast. Only then does professor Roch understand what his invention will be used for if it remains in Artigas's hands. He sacrifices his own life and blows up the entire island.
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