An alien crashes on Earth and hides in a remote Colorado mountain town. After assuming the identity of the town doctor, his nefarious mission is threatened when he realises one of the townspeople, a nine-year-old boy, can see his true alien form.
The story of how an inhabitant of another planet suddenly makes an unplanned landing on planet Earth. He is forced to do this, because his spacecraft has broken down and it will take time to bring it into working order. So that no one can notice and expose him, the alien decides to move into the human body, but it is not so easy to find this. The focus is on a doctor named Harry Vanderspeigle.
He is a great specialist in his field and knows everything he does. One day the doctor’s life is interrupted. This occurs at the moment when he is attacked, as a result of which he is mortally wounded. Meanwhile, an alien was watching everything that was happening, who decided to use the body of the deceased man and stay in it until he settled his affairs. However, the hero of the series had no idea that he would have to visit the planet of people longer than he planned.