"Infiltration" is a science fiction novel by the famous American writer Algis Budrys. This fascinating book tells the story of a being who comes to Earth to study the human race. Invisible to most people, she probes their thoughts and feelings, memory fragments and capacity for empathy. Through this contact, earthlings begin to understand themselves and each other better, but at the same time threats arise for the infiltrator creature itself. The author successfully combines science fiction with philosophical reflection on human nature and humanity's place in the universe. "Infiltration" leaves the reader impressed and thoughtful, opening new horizons in the world of scientific literature.