During the extinguishing of the fire, under confusing circumstances, one of the firefighters, the commander of the unit, Egor Yeremenko, was seriously injured. For a secret investigation, Lieutenant Viktor Zhuravlev comes to the fire department under the guise of an intern, whose main task is not only to find the culprit in the terrible incident, but also to sort out conflicts in the fire department. The second commander of the unit, the experienced Maxim Knyazev, takes over the patronage of the young rescuer.
Zhuravlev's arrival in the unit provokes a series of events in the lives of the main characters that will change the lives of absolutely everyone. Each of the characters has their own personal story — sometimes dramatic, sometimes funny and absurd. However, for all of them, the most important thing is human lives, which they save every time they respond to calls and fight fires. Thus, a seemingly ordinary fire will lead Yegor and Max to the conclusion that it wasn't an accident, but a deliberate and very cleverly planned arson. It will trigger a series of fires, and all of them, as it turns out later, are the work of the same arsonist. And now, Zhuravlev not only needs to solve the task assigned to him by his superiors but also to figure out who is hiding behind the identity of the arsonist — a crazy maniac or a cynical professional pursuing very practical goals.
