"The Gatekeeper" is an exciting science fiction novel written by genre legend Robert Heinlein. In this book, the author examines the complex issues of intergalactic relations, war and peace, man and machines. The main character, Michael, accidentally becomes a participant in the conflict between an intergalactic alliance and a mysterious race of Vargans. Will he be able to understand and save his planet from the danger coming from space? The plot of the novel is intriguing, and the images of the characters remain in the memory for a long time. "The Keeper of the Gate" is a book that will make the reader think about the place of man in relation to the Universe and his own responsibility for the future.