The third book in the series of adventures of Captain Future - a space superhero from the future, a genius of science and technology, an adventurer and the most implacable crime fighter of all times. A group of terrorists led by an unknown person calling himself the Destroyer destroys mines on all planets. extraction of gravium - a mineral thanks to which all interplanetary activity of the Solar system is carried out.  The Destroyer's goals are unclear. He doesn't make any demands. The disappearance of gravium threatens the interplanetary community with a deep economic crisis. The President calls Captain Future...