...The end of the world is near, the invasion of formidable alien civilizations is coming, and nothing can be changed. No, this is not an advertisement for a new science-fiction blockbuster, but part of a popular science film in the planetarium, to which Grisha dragged Marusya on a beautiful summer day....The end of the world did not happen, but a corpse was found in the corridor of the planetarium. And the worst thing is that Marusya and her childhood friend Grisha had just talked with ufologist Yuri Fedorovich. He was alive and well and warned humanity against a terrible catastrophe. Marusya, a twenty-four-year-old girl, a French teacher, lives a very boring life. The only entertainment in her life is her craving for detective investigations. Marusya and Grisha begin to “investigate”!.. On the path of this very “following” they will come across good people and not so good people, strange events and incomprehensible accidents will happen. Together with Grisha, they will establish the truth - the ufologist was killed, and it was not aliens at all...