Another visit by employees of the regular Moscow district fire department ends tragically. While rescuing a homeless person from a fire, fire crew commander Zakhar Kuznetsov dies.
The man rescued from the burnt-out homeless site turns out to be a sailor of the trawl fleet, Denis Ragozin, who came to the capital in search of his runaway wife. Having learned from Captain Mitrokhin, who is investigating the fire, the name of his savior, Denis decides to become a firefighter and go to work in the unit where the deceased Kuznetsov served.
However, not everyone likes Ragozin's wishes. Kuznetsov's wife, who got a job as a dispatcher at the fire department after her husband's death, the new crew commander Zubov and some other ordinary firefighters do not want to see Ragozin. But perseverance and dedication help Denis achieve his goal and become one of the best among the capital's firefighters...