"Symbiont" is an exciting science fiction book written by the Australian writer Meera Grant. This is the second book in the "Parasite" series and maintains the tense atmosphere of its predecessor, shaded by even more complex moral dilemmas and unexpected turns of events. In this book, the main character, a gypsy anthropologist Sally Mitchell, is forced to face new challenges related to a virus that controls the activity of the human brain. Because of this, she is looking for answers to questions about the origin of this virus, as well as possible ways to destroy it. Observing the interaction between man and a symbiotic organism that pulls Earthlings out of depression and monotony makes this book fascinating for those interested in the intriguing scientific concepts and psychological aspects of creature interaction. "Symbiont" is an exciting journey into the world of science and morality, which will leave readers enthralled from the first to the last page.