"Alien" is a science fiction novel by the famous American writer Robert Heinlein. The book tells about an ordinary guy named Joel, who finds himself on a foreign planet without family and friends. He quickly learns that he has strange abilities here that he must learn in order to survive in a dangerous environment. During his journey, Joel will encounter powerful new entities and important life choices that will change him forever. "Alien" is a book that reflects on the themes of loneliness, escape from reality and the amazing possibilities of space.