Vladimir Pushkarev and Konstantin Utkin are two inseparable friends, lovers of danger and adrenaline shocks. And their work is a match for hot-headed people: extreme firefighters. Extinguishing emergency reactors, rescuing people from anomalous zones in secret institutes... It would seem that nothing can hurt a person in such a job. But one day, after an explosion at the Troitsky thermonuclear stellarator, Vladimir and Konstantin saw something that completely changed their ideas about reality. This is what forced them to immediately leave the fire department, opened the way to the stars, led them to the most secret organization on Earth - the Space Marines...