The Earth is hopelessly doomed - the insidious aliens from Titan, who secretly landed on our long-suffering planet, began their victorious march, turning unsuspecting people into their slaves. These creatures, weak and helpless in their own bodies, parasitize people, subjugating them to their will and using them to achieve their goals. There are no limits to their cunning and deceit, but in the way of the alien invaders stand the valiant agents of the mysterious Department - a deeply secret intelligence service, the existence of which only the President of the United States knows... Two novels by Robert Heinlein, rightfully included in the “golden fund” of science fiction, are in front of you...